diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index 3a7b171442..81845253c8 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -9,12 +9,11 @@ jobs:
       NIXPKGS_ALLOW_INSECURE: 1
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
         submodules: true
-    - uses: cachix/install-nix-action@v13
+    - uses: cachix/install-nix-action@V27
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - run: |
-        nix-shell --command "dune runtest --profile=dev cohttp cohttp-async cohttp-curl cohttp-curl-async cohttp-curl-lwt cohttp-lwt cohttp-lwt-unix cohttp-mirage cohttp-server-lwt-unix cohttp-top http"
-        nix-shell --command "dune build --profile=dev cohttp-lwt-jsoo"
+        nix develop -c dune runtest
diff --git a/Makefile b/Makefile
index 650db2eacc..5a296b8538 100644
--- a/Makefile
+++ b/Makefile
@@ -15,10 +15,6 @@ clean:
 fmt:
 	dune b @fmt --auto-promote
 
-.PHONY: nix/opam-selection.nix
-nix/opam-selection.nix:
-	nix-shell -A resolve default.nix
-
 eio: #build eio
 	dune build cohttp-eio
 
@@ -26,4 +22,4 @@ eio-test:
 	dune runtest cohttp-eio
 
 eio-shell: # nix-shell for eio dev
-	nix-shell -p gmp libev nmap curl
+	nix develop .#eio
diff --git a/default.nix b/default.nix
deleted file mode 100644
index 74bc213813..0000000000
--- a/default.nix
+++ /dev/null
@@ -1,3 +0,0 @@
-# standalone derivation, for nix-build, nix-shell, etc
-{ pkgs ? import <nixpkgs> {}, opam2nix ? import ./nix/opam2nix.nix }:
-pkgs.callPackage ./nix { inherit opam2nix; }
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000000..a83db54a5f
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,113 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1719186318,
+        "narHash": "sha256-H6bVeSIy34Fmhe756Q+hTlHnCgYLsKpOklY69tyj9NM=",
+        "owner": "nix-ocaml",
+        "repo": "nix-overlays",
+        "rev": "97eb195f9e19d3a006a84d978de2cdafe610d429",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-ocaml",
+        "repo": "nix-overlays",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1719146883,
+        "narHash": "sha256-DAyIfQgyqalov0DcEKRvDOUin7axELasaP6NCPt7UQA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "084f8df2f3ff80cdec6f515931036f63c5d2f36c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "084f8df2f3ff80cdec6f515931036f63c5d2f36c",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000000..def8724793
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,138 @@
+{
+  description = "Cohttp Nix Flake";
+
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  inputs.nixpkgs.url = "github:nix-ocaml/nix-overlays";
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = (import nixpkgs {
+          inherit system;
+          overlays = [
+            (final: prev: {
+              ocamlPackages = prev.ocamlPackages.overrideScope' (oself: osuper: {
+                ctypes-foreign = osuper.ctypes-foreign.overrideAttrs (_: { doCheck = false; });
+                ctypes = osuper.ctypes.overrideAttrs (_: { doCheck = false; });
+                mdx = osuper.mdx.override {
+                  # workaround for:
+                  # https://github.com/NixOS/nixpkgs/pull/241476/commits/1ed74f3536d29e5635d7f47a1d7b82a89f5a8077
+                  logs = oself.logs;
+                };
+              });
+            })
+          ];
+        });
+        inherit (pkgs.ocamlPackages) buildDunePackage;
+        pkg = attrs: buildDunePackage ({
+            version = "n/a";
+            src = ./. ;
+            duneVersion = "3";
+            doCheck = true;
+          } // attrs);
+        ocamlformat = pkgs.ocamlformat_0_26_2;
+      in
+      with pkgs.ocamlPackages; rec {
+        packages = rec {
+          default = http;
+          http = pkg {
+            pname = "http";
+            checkInputs = [ alcotest base_quickcheck ppx_expect crowbar ];
+          };
+          cohttp = pkg {
+            pname = "cohttp";
+            checkInputs = [ fmt alcotest ];
+            propagatedBuildInputs = [
+              stringext http re uri uri-sexp logs sexplib0 ppx_sexp_conv
+            ];
+          };
+          cohttp-top = pkg {
+            pname = "cohttp-top";
+            propagatedBuildInputs = [ cohttp ];
+          };
+          cohttp-curl = pkg {
+            pname = "cohttp-curl";
+            propagatedBuildInputs = [ ocurl http stringext ];
+          };
+          cohttp-curl-lwt = pkg {
+            pname = "cohttp-curl-lwt";
+            checkInputs = [ cohttp-lwt-unix cohttp cohttp-lwt conduit-lwt ounit uri ];
+            propagatedBuildInputs = [ ocurl http stringext lwt ];
+          };
+          cohttp-curl-async = pkg {
+            pname = "cohttp-curl-async";
+            checkInputs = [ uri fmt ounit alcotest cohttp-async ];
+            propagatedBuildInputs = [
+              ocurl http stringext cohttp-curl core core_unix
+              async_kernel async_unix 
+            ];
+          };
+          cohttp-lwt = pkg {
+            pname = "cohttp-lwt";
+            propagatedBuildInputs = [ http cohttp lwt sexplib0 ppx_sexp_conv logs uri ];
+          };
+          cohttp-lwt-jsoo = pkg {
+            pname = "cohttp-lwt-jsoo";
+            propagatedBuildInputs = [
+              http cohttp cohttp-lwt logs lwt lwt_ppx js_of_ocaml
+              js_of_ocaml-ppx js_of_ocaml-lwt
+            ];
+          };
+          cohttp-async = pkg {
+            pname = "cohttp-async";
+            checkInputs = [ mirage-crypto ounit ];
+            propagatedBuildInputs = [ http cohttp async_kernel async_unix async base
+              core core_unix conduit-async magic-mime logs fmt sexplib0 ppx_sexp_conv
+              uri uri-sexp ipaddr
+            ];
+          };
+          cohttp-lwt-unix = pkg {
+            pname = "cohttp-lwt-unix";
+            checkInputs = [ ounit ];
+            propagatedBuildInputs = [
+              http cohttp cohttp-lwt cmdliner lwt conduit-lwt
+              conduit-lwt-unix fmt ppx_sexp_conv magic-mime logs
+            ];
+          };
+          cohttp-server-lwt-unix = pkg {
+            pname = "cohttp-server-lwt-unix";
+            checkInputs = [ conduit-lwt-unix cohttp-lwt cohttp-lwt-unix ];
+            propagatedBuildInputs = [ http lwt ];
+          };
+          cohttp-eio = pkg {
+            pname = "cohttp-eio";
+            checkInputs = [ alcotest eio_main mdx ppx_here
+              tls-eio 
+              mirage-crypto-rng-eio
+            ];
+            propagatedBuildInputs = [ cohttp eio eio_main logs uri fmt ptime http ];
+          };
+          cohttp-mirage = pkg {
+            pname = "cohttp-mirage";
+            propagatedBuildInputs = [
+              mirage-flow mirage-channel conduit conduit-mirage
+              mirage-kv lwt cohttp-lwt cstruct fmt astring magic-mime ppx_sexp_conv
+            ];
+          };
+          cohttp-bench = pkg {
+            pname = "cohttp-bench";
+            buildInputs = [
+              core core_bench eio http cohttp cohttp-eio
+              cohttp-lwt-unix cohttp-server-lwt-unix cohttp-async
+            ];
+          };
+        };
+        devShells.default = pkgs.mkShell {
+          inputsFrom = pkgs.lib.attrValues packages;
+          buildInputs = [ ocamlformat ] ++ (with pkgs.ocamlPackages; [
+            ocaml-lsp
+          ]);
+        };
+        devShells.eio = pkgs.mkShell {
+          inputsFrom = [ cohttp-eio ];
+          buildInputs = [ ocamlformat ] ++ (with pkgs; [
+            ocamlPackages.ocaml-lsp gmp libev nmap curl
+          ]);
+        };
+      });
+}
diff --git a/nix/default.nix b/nix/default.nix
deleted file mode 100644
index 3eb7784908..0000000000
--- a/nix/default.nix
+++ /dev/null
@@ -1,50 +0,0 @@
-# paramaterised derivation with dependencies injected (callPackage style)
-{ pkgs, stdenv, opam2nix }:
-let
-  strings = pkgs.lib.strings;
-  args = {
-    inherit (pkgs.ocaml-ng.ocamlPackages_4_14) ocaml;
-    selection = ./opam-selection.nix;
-    src =
-      let ignores = pkgs.lib.strings.fileContents ../.gitignore
-        + builtins.foldl' (acc: e: acc + "\n" + e) "\n"
-        [ "nix" "shell.nix" "default.nix" ];
-      in pkgs.nix-gitignore.gitignoreSourcePure ignores ../.;
-  };
-  opam-selection = opam2nix.build args;
-  localPackages =
-    let 
-      contents = builtins.attrNames (builtins.readDir ../.);
-      filter = p: strings.hasSuffix ".opam" p && "cohttp-eio.opam" != p;
-    in builtins.filter filter contents;
-  resolve = opam2nix.resolve args (localPackages ++ [
-    # dev deps
-    "ppx_expect"
-    "conf-libev"
-    "ocamlformat-rpc"
-    "fmt"
-    "alcotest"
-    "ounit"
-    "lwt_ppx"
-    "base_quickcheck"
-    "ppx_assert"
-    "ppx_sexp_conv"
-    "ppx_compare"
-    "ppx_here"
-    "core_bench"
-    "crowbar"
-  ]);
-
-in
-(builtins.listToAttrs (builtins.map
-  (fname:
-    let packageName = strings.removeSuffix ".opam" fname;
-    in
-    {
-      name = packageName;
-      value = builtins.getAttr packageName opam-selection;
-    })
-  localPackages)) // {
-  inherit resolve;
-  opam = opam-selection;
-}
diff --git a/nix/opam-selection.nix b/nix/opam-selection.nix
deleted file mode 100644
index ce991c9157..0000000000
--- a/nix/opam-selection.nix
+++ /dev/null
@@ -1,3852 +0,0 @@
-### This file is generated by opam2nix.
-
-self:
-let
-    lib = self.lib;
-    pkgs = self.pkgs;
-    selection = self.selection;
-    repoPath = self.repoPath;
-    repos = 
-    {
-      opam-repository = 
-      rec {
-        fetch = 
-        {
-          owner = "ocaml";
-          repo = "opam-repository";
-          rev = "94675aaefe68e1e4a4ad959d88dd65afa3a9ed3d";
-          sha256 = "000j8af2nv4j269ap2ip92jnip8ji3c3mkdx4wjkpzv6y35vqw80";
-        };
-        src = (pkgs.fetchFromGitHub) fetch;
-      };
-    };
-in
-{
-  format-version = 4;
-  inherit repos;
-  ocaml-version = "4.14.0";
-  selection = 
-  {
-    afl-persistent = 
-    {
-      pname = "afl-persistent";
-      version = "1.3";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/stedolan/ocaml-afl-persistent/archive/v1.3.tar.gz";
-        sha256 = "0p8flm9h2qj6fc3j4qn727mkwc5v00kxslcrdcafx9s8jlxw8j0i";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml base-unix;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/afl-persistent/afl-persistent.1.3";
-        hash = "sha256:1z90chpyc6qj7lmwwjwfszy9k4127xhhd5l7ww6sw68kjp9zjk0c";
-      };
-    };
-    alcotest = 
-    {
-      pname = "alcotest";
-      version = "1.6.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/alcotest/releases/download/1.6.0/alcotest-1.6.0.tbz";
-        sha256 = "0a939glmndarbnr3w4ilvnkjzh7g2inmdvypn7rlz1wmhdkgj07x";
-      };
-      opamInputs = 
-      {
-        inherit (selection) uutf stdlib-shims re ocaml-syntax-shims ocaml fmt
-        dune cmdliner astring;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/alcotest/alcotest.1.6.0";
-        hash = "sha256:0hvmdg6kp6zcnjwa3gc85ilfm67iinrdjpjjc5ginhc43hbd93ap";
-      };
-    };
-    angstrom = 
-    {
-      pname = "angstrom";
-      version = "0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/inhabitedtype/angstrom/archive/0.15.0.tar.gz";
-        sha256 = "01cjjal8vjsm225v9y0q6ixam8k5f821rcr6yix6i9nzs84aq6gi";
-      };
-      opamInputs = 
-      {
-        inherit (selection) result ocaml-syntax-shims ocaml dune bigstringaf;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/angstrom/angstrom.0.15.0";
-        hash = "sha256:07ryik3g3hz79hnfdwxdh2jsw3cmbgygjs7mjdw07p927wkd83k9";
-      };
-    };
-    arp = 
-    {
-      pname = "arp";
-      version = "3.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/arp/releases/download/v3.0.0/arp-v3.0.0.tbz";
-        sha256 = "1x3l8v96ywc3wrcwbf0j04b8agap4fif0fz6ki2ndzx57yqcjszn";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml mirage-time mirage-profile macaddr lwt logs
-        ipaddr ethernet duration dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/arp/arp.3.0.0";
-        hash = "sha256:1w42wy759x6y3zm0kiqnk46h0liy96775v8y4ybqkpz2pahnmp65";
-      };
-    };
-    asn1-combinators = 
-    {
-      pname = "asn1-combinators";
-      version = "0.2.6";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirleft/ocaml-asn1-combinators/releases/download/v0.2.6/asn1-combinators-v0.2.6.tbz";
-        sha256 = "148s3clqws2nmzwhvlgy0b3nnvq2xbw1qb3mcc865vv9i06xwah1";
-      };
-      opamInputs = 
-      {
-        inherit (selection) zarith ptime ocaml dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/asn1-combinators/asn1-combinators.0.2.6";
-        hash = "sha256:03s1aska9ws9pnjm3v7f69qcx5gdmjh53ximh5zy9v9vf2sxbdsr";
-      };
-    };
-    astring = 
-    {
-      pname = "astring";
-      version = "0.8.5";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/astring/releases/astring-0.8.5.tbz";
-        sha256 = "1ykhg9gd3iy7zsgyiy2p9b1wkpqg9irw5pvcqs3sphq71iir4ml6";
-      };
-      opamInputs = 
-      {
-        inherit (selection) topkg ocamlfind ocamlbuild ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/astring/astring.0.8.5";
-        hash = "sha256:1djnad9sq12idlakj069xvwm2nn7wqm137pqbxxai5frkgi08x74";
-      };
-    };
-    async = 
-    {
-      pname = "async";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/async-v0.15.0.tar.gz";
-        sha256 = "1afnls0m4izzp933h606k0vj43krfsy4ypnybsidq7pd9cfb4fqd";
-      };
-      opamInputs = 
-      {
-        inherit (selection) textutils ppx_log ppx_jane ocaml dune core_unix
-        core_kernel core async_unix async_rpc_kernel async_kernel;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/async/async.v0.15.0";
-        hash = "sha256:04n4xaylnv77p1i3s02rf7vai33gj0id3g82yb6a81w6fbrb2k3h";
-      };
-    };
-    async_kernel = 
-    {
-      pname = "async_kernel";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/async_kernel-v0.15.0.tar.gz";
-        sha256 = "15n65wqyzqnvk66dq1rgzdl68ixfp1ri02zib7p2gcdh9c0kwx9h";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_jane ocaml dune core_kernel core;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/async_kernel/async_kernel.v0.15.0";
-        hash = "sha256:1n8iksr71jxnhrq6x4vd4x1b0ncjq7q329k0a8fr9vlhh9nvdbs1";
-      };
-    };
-    async_rpc_kernel = 
-    {
-      pname = "async_rpc_kernel";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/async_rpc_kernel-v0.15.0.tar.gz";
-        sha256 = "07aq9fz1cqyfy3sarwrdh0rzw57b4balmagdqwsfs1c2rjffk4d7";
-      };
-      opamInputs = 
-      {
-        inherit (selection) protocol_version_header ppx_jane ocaml dune core
-        async_kernel;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/async_rpc_kernel/async_rpc_kernel.v0.15.0";
-        hash = "sha256:06l6g4gs1i6klfz9xjdj2cnkq9r7nz84lv9gd2ml7c5v3d5s7bhr";
-      };
-    };
-    async_unix = 
-    {
-      pname = "async_unix";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/async_unix-v0.15.0.tar.gz";
-        sha256 = "1i9vrflp5df5d31q01643l412wrwizisb0qak1mfszqrqikrv4a9";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_jane ocaml dune core_unix core_kernel core
-        async_kernel;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/async_unix/async_unix.v0.15.0";
-        hash = "sha256:14xc0i5mqzbzj26w1xh21i5hyh8hwgjarfaq278ym73markx5mhb";
-      };
-    };
-    base = 
-    {
-      pname = "base";
-      version = "v0.15.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/base/archive/refs/tags/v0.15.1.tar.gz";
-        sha256 = "050syrp6v00gn50d6xvwv6a36zsk4zmahymgllxpw9paf4qk0pkm";
-      };
-      opamInputs = 
-      {
-        inherit (selection) sexplib0 ocaml dune-configurator dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/base/base.v0.15.1";
-        hash = "sha256:0gx21y0rnza0dqj3i1fdblf9n3cd56awyd9md3dd8v41f1fvqi97";
-      };
-    };
-    base-bytes = 
-    {
-      pname = "base-bytes";
-      version = "base";
-      src = null;
-      opamInputs = {
-                     inherit (selection) ocamlfind ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/base-bytes/base-bytes.base";
-        hash = "sha256:0a68lmbf68jgm1i3b59j2sc3ha9yhv4678f9mfwwvczw88prq7l3";
-      };
-    };
-    base-threads = 
-    {
-      pname = "base-threads";
-      version = "base";
-      src = null;
-      opamInputs = {
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/base-threads/base-threads.base";
-        hash = "sha256:1c4bpyh61ampjgk5yh3inrgcpf1z1xv0pshn54ycmpn4dyzv0p2x";
-      };
-    };
-    base-unix = 
-    {
-      pname = "base-unix";
-      version = "base";
-      src = null;
-      opamInputs = {
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/base-unix/base-unix.base";
-        hash = "sha256:0mpsvb7684g723ylngryh15aqxg3blb7hgmq2fsqjyppr36iyzwg";
-      };
-    };
-    base64 = 
-    {
-      pname = "base64";
-      version = "3.5.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-base64/releases/download/v3.5.0/base64-v3.5.0.tbz";
-        sha256 = "19735bvb3k263hzcvdhn4d5lfv2qscc9ib4q85wgxsvq0p0fk7aq";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml dune base-bytes;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/base64/base64.3.5.0";
-        hash = "sha256:0al6p4jbvr6z0h66w3s1circ4cb3lf286dmx6q5ylh1kfhmzas70";
-      };
-    };
-    base_bigstring = 
-    {
-      pname = "base_bigstring";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/base_bigstring-v0.15.0.tar.gz";
-        sha256 = "0syml7735f0slaw2p6asmgrs6bbzzyzy397b98jb10xgidsg2xgz";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_jane ocaml int_repr dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/base_bigstring/base_bigstring.v0.15.0";
-        hash = "sha256:0l92waghxzr8n89dfz221vl12502h1h2kg8c1zsqjzqhcxqz8a5j";
-      };
-    };
-    base_quickcheck = 
-    {
-      pname = "base_quickcheck";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/base_quickcheck-v0.15.0.tar.gz";
-        sha256 = "1wl107032kcd439p50yg7bk0wdv1fygcpzl8xhv8jfb06s7nn3in";
-      };
-      opamInputs = 
-      {
-        inherit (selection) splittable_random ppxlib ppx_sexp_value
-        ppx_sexp_message ppx_let ppx_fields_conv ppx_base ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/base_quickcheck/base_quickcheck.v0.15.0";
-        hash = "sha256:1laa3xw5pbz6hsq711fpx86vh0b3jmzc28ahz6j57hs15b64c7vg";
-      };
-    };
-    bigstringaf = 
-    {
-      pname = "bigstringaf";
-      version = "0.9.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/inhabitedtype/bigstringaf/archive/0.9.0.tar.gz";
-        sha256 = "0v0h09r0690b6b27ww443zxvj1dwhxcy86fbjaf2wm56kb3qccsl";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml dune
-        conf-pkg-config;
-        ocaml-freestanding = selection.ocaml-freestanding or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/bigstringaf/bigstringaf.0.9.0";
-        hash = "sha256:0g8fa097yzywbc453p7c4y62s90qh83by686av95ch9d2dw0kwgj";
-      };
-    };
-    bin_prot = 
-    {
-      pname = "bin_prot";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/bin_prot-v0.15.0.tar.gz";
-        sha256 = "141nkl2qiwgii7biz074vrjbp6rsqkx9mx78nyf7xf6gxbda0jvs";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_variants_conv ppx_sexp_conv ppx_optcomp
-        ppx_fields_conv ppx_custom_printf ppx_compare ocaml dune
-        base;
-        mirage-xen-ocaml = selection.mirage-xen-ocaml or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/bin_prot/bin_prot.v0.15.0";
-        hash = "sha256:15p4b5lj44ds81i8xpnqsdvfgzha02c6z4jqdl3lkmvn4i0zrja2";
-      };
-    };
-    bos = 
-    {
-      pname = "bos";
-      version = "0.2.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/bos/releases/bos-0.2.1.tbz";
-        sha256 = "0dwg7lpaq30rvwc5z1gij36fn9xavvpah1bj8ph9gmhhddw2xmnq";
-      };
-      opamInputs = 
-      {
-        inherit (selection) topkg rresult ocamlfind ocamlbuild ocaml logs
-        fpath fmt base-unix astring;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/bos/bos.0.2.1";
-        hash = "sha256:112gl185kjqmkjk54crcimdnpnzf7g1k35srzpkvc4z79x2j0myd";
-      };
-    };
-    ca-certs = 
-    {
-      pname = "ca-certs";
-      version = "0.2.3";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ca-certs/releases/download/v0.2.3/ca-certs-0.2.3.tbz";
-        sha256 = "170fqqprqg6nxmc4y8905vwmcbzcwlxjzy6yhgbzcpligm2xdn6j";
-      };
-      opamInputs = 
-      {
-        inherit (selection) x509 ptime ocaml mirage-crypto logs fpath dune
-        bos astring;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ca-certs/ca-certs.0.2.3";
-        hash = "sha256:1rsb6c398yvq7p13nggmslc3441h06m3ccjh34ckarc64k2yz4w1";
-      };
-      buildInputs = [ (pkgs.ca_root_nss or null) ];
-    };
-    ca-certs-nss = 
-    {
-      pname = "ca-certs-nss";
-      version = "3.83";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ca-certs-nss/releases/download/v3.83/ca-certs-nss-3.83.tbz";
-        sha256 = "07w8vab8fs2zzhijdzafhj7lzb7y02ccmsk39hwczm2zmxfsgmg1";
-      };
-      opamInputs = 
-      {
-        inherit (selection) x509 ocaml mirage-crypto mirage-clock logs fmt
-        dune cmdliner bos astring;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ca-certs-nss/ca-certs-nss.3.83";
-        hash = "sha256:0rv9368szg13bj0sd1m8s7y43j0k2rndhx6clmbjqx5vzdl77rls";
-      };
-    };
-    camlp-streams = 
-    {
-      pname = "camlp-streams";
-      version = "5.0.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml/camlp-streams/archive/v5.0.1.tar.gz";
-        sha256 = "196rn0z2q53f8is5bwln1n5qzipn5bg3wnflnmzlxfz90qjgcwdd";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/camlp-streams/camlp-streams.5.0.1";
-        hash = "sha256:177a68cgm23pryyji88dvn300qz55sl154wfwmzvp8arhs7yg6bn";
-      };
-    };
-    cmdliner = 
-    {
-      pname = "cmdliner";
-      version = "1.1.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/cmdliner/releases/cmdliner-1.1.1.tbz";
-        sha256 = "1yxm4x34cbi06bfld601ds9drlbnyx0797ym3n6yyh4rlz1qgbm1";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/cmdliner/cmdliner.1.1.1";
-        hash = "sha256:0zp0q9213an1spx8ps70xlm9rhmjfqmixh59b3mb7dsj1r6p19i7";
-      };
-    };
-    cohttp = 
-    {
-      pname = "cohttp";
-      version = "development";
-      src = self.directSrc "cohttp";
-      opamInputs = 
-      {
-        inherit (selection) uri-sexp uri stringext sexplib0 re ppx_sexp_conv
-        ocaml http dune base64;
-      };
-      opamSrc = "cohttp.opam";
-    };
-    cohttp-async = 
-    {
-      pname = "cohttp-async";
-      version = "development";
-      src = self.directSrc "cohttp-async";
-      opamInputs = 
-      {
-        inherit (selection) uri-sexp uri sexplib0 ppx_sexp_conv ocaml
-        magic-mime logs ipaddr http fmt dune core_unix conduit-async cohttp
-        base async_unix async_kernel async;
-      };
-      opamSrc = "cohttp-async.opam";
-    };
-    cohttp-bench = 
-    {
-      pname = "cohttp-bench";
-      version = "development";
-      src = self.directSrc "cohttp-bench";
-      opamInputs = 
-      {
-        inherit (selection) http dune core_bench core cohttp-server-lwt-unix
-        cohttp-lwt-unix cohttp-async cohttp;
-      };
-      opamSrc = "cohttp-bench.opam";
-    };
-    cohttp-curl = 
-    {
-      pname = "cohttp-curl";
-      version = "development";
-      src = self.directSrc "cohttp-curl";
-      opamInputs = 
-      {
-        inherit (selection) stringext ocurl ocaml http dune;
-      };
-      opamSrc = "cohttp-curl.opam";
-    };
-    cohttp-curl-async = 
-    {
-      pname = "cohttp-curl-async";
-      version = "development";
-      src = self.directSrc "cohttp-curl-async";
-      opamInputs = 
-      {
-        inherit (selection) stringext ocurl http dune core_unix core
-        cohttp-curl async_unix async_kernel;
-      };
-      opamSrc = "cohttp-curl-async.opam";
-    };
-    cohttp-curl-lwt = 
-    {
-      pname = "cohttp-curl-lwt";
-      version = "development";
-      src = self.directSrc "cohttp-curl-lwt";
-      opamInputs = 
-      {
-        inherit (selection) stringext ocurl ocaml lwt http dune cohttp-curl;
-      };
-      opamSrc = "cohttp-curl-lwt.opam";
-    };
-    cohttp-lwt = 
-    {
-      pname = "cohttp-lwt";
-      version = "development";
-      src = self.directSrc "cohttp-lwt";
-      opamInputs = 
-      {
-        inherit (selection) uri sexplib0 ppx_sexp_conv ocaml lwt logs http
-        dune cohttp;
-      };
-      opamSrc = "cohttp-lwt.opam";
-    };
-    cohttp-lwt-jsoo = 
-    {
-      pname = "cohttp-lwt-jsoo";
-      version = "development";
-      src = self.directSrc "cohttp-lwt-jsoo";
-      opamInputs = 
-      {
-        inherit (selection) ocaml lwt logs js_of_ocaml-ppx js_of_ocaml-lwt
-        js_of_ocaml http dune cohttp-lwt cohttp;
-      };
-      opamSrc = "cohttp-lwt-jsoo.opam";
-    };
-    cohttp-lwt-unix = 
-    {
-      pname = "cohttp-lwt-unix";
-      version = "development";
-      src = self.directSrc "cohttp-lwt-unix";
-      opamInputs = 
-      {
-        inherit (selection) ppx_sexp_conv ocaml magic-mime lwt logs http fmt
-        dune conduit-lwt-unix conduit-lwt cohttp-lwt cohttp cmdliner
-        base-unix;
-      };
-      opamSrc = "cohttp-lwt-unix.opam";
-    };
-    cohttp-mirage = 
-    {
-      pname = "cohttp-mirage";
-      version = "development";
-      src = self.directSrc "cohttp-mirage";
-      opamInputs = 
-      {
-        inherit (selection) ppx_sexp_conv ocaml mirage-kv mirage-flow
-        mirage-channel magic-mime lwt fmt dune cstruct conduit-mirage conduit
-        cohttp-lwt cohttp astring;
-      };
-      opamSrc = "cohttp-mirage.opam";
-    };
-    cohttp-server-lwt-unix = 
-    {
-      pname = "cohttp-server-lwt-unix";
-      version = "development";
-      src = self.directSrc "cohttp-server-lwt-unix";
-      opamInputs = 
-      {
-        inherit (selection) ocaml lwt http dune;
-      };
-      opamSrc = "cohttp-server-lwt-unix.opam";
-    };
-    cohttp-top = 
-    {
-      pname = "cohttp-top";
-      version = "development";
-      src = self.directSrc "cohttp-top";
-      opamInputs = 
-      {
-        inherit (selection) ocaml dune cohttp;
-      };
-      opamSrc = "cohttp-top.opam";
-    };
-    conduit = 
-    {
-      pname = "conduit";
-      version = "6.0.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-conduit/releases/download/v6.0.1/conduit-6.0.1.tbz";
-        sha256 = "08lrf04csq52kn9kqkdp4p4r9kbbapg44x44j4g35w9k605jn6cx";
-      };
-      opamInputs = 
-      {
-        inherit (selection) uri sexplib ppx_sexp_conv ocaml logs ipaddr-sexp
-        ipaddr dune astring;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/conduit/conduit.6.0.1";
-        hash = "sha256:1gmq7q7iayf3klb4ipgryxqj9cjbfib8vw8iq39y2sfqa5jwas3l";
-      };
-    };
-    conduit-async = 
-    {
-      pname = "conduit-async";
-      version = "6.0.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-conduit/releases/download/v6.0.1/conduit-6.0.1.tbz";
-        sha256 = "08lrf04csq52kn9kqkdp4p4r9kbbapg44x44j4g35w9k605jn6cx";
-      };
-      opamInputs = 
-      {
-        inherit (selection) uri sexplib ppx_sexp_conv ppx_here ocaml
-        ipaddr-sexp ipaddr dune core conduit
-        async;
-        async_ssl = selection.async_ssl or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/conduit-async/conduit-async.6.0.1";
-        hash = "sha256:15mrlwrr4pyzhva32crsl3n4nn6pzjnj12fip39h4mx0g589hixn";
-      };
-    };
-    conduit-lwt = 
-    {
-      pname = "conduit-lwt";
-      version = "6.0.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-conduit/releases/download/v6.0.1/conduit-6.0.1.tbz";
-        sha256 = "08lrf04csq52kn9kqkdp4p4r9kbbapg44x44j4g35w9k605jn6cx";
-      };
-      opamInputs = 
-      {
-        inherit (selection) sexplib ppx_sexp_conv ocaml lwt dune conduit
-        base-unix;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/conduit-lwt/conduit-lwt.6.0.1";
-        hash = "sha256:01zdi4cplwm5lps4ss7spi9444bgzl3v41bd3935jvzf6i48mks3";
-      };
-    };
-    conduit-lwt-unix = 
-    {
-      pname = "conduit-lwt-unix";
-      version = "6.0.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-conduit/releases/download/v6.0.1/conduit-6.0.1.tbz";
-        sha256 = "08lrf04csq52kn9kqkdp4p4r9kbbapg44x44j4g35w9k605jn6cx";
-      };
-      opamInputs = 
-      {
-        inherit (selection) uri ppx_sexp_conv ocaml lwt logs ipaddr-sexp
-        ipaddr dune conduit-lwt ca-certs
-        base-unix;
-        tls = selection.tls or null;
-        lwt_ssl = selection.lwt_ssl or null;
-        launchd = selection.launchd or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/conduit-lwt-unix/conduit-lwt-unix.6.0.1";
-        hash = "sha256:0gjzi6hr9q47saqjh4gly72pzvs62ikjvlqzyxywyy99a4lv374h";
-      };
-    };
-    conduit-mirage = 
-    {
-      pname = "conduit-mirage";
-      version = "6.0.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-conduit/releases/download/v6.0.1/conduit-6.0.1.tbz";
-        sha256 = "08lrf04csq52kn9kqkdp4p4r9kbbapg44x44j4g35w9k605jn6cx";
-      };
-      opamInputs = 
-      {
-        inherit (selection) xenstore vchan uri tls-mirage tls tcpip sexplib
-        ppx_sexp_conv ocaml mirage-time mirage-random mirage-flow-combinators
-        mirage-flow mirage-clock ipaddr-sexp ipaddr fmt dune dns-client
-        cstruct conduit-lwt ca-certs-nss;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/conduit-mirage/conduit-mirage.6.0.1";
-        hash = "sha256:0qg5m6y3jbyxaq3224gx2rx2viy0861qirhzk3szsjarzagw8ls6";
-      };
-    };
-    conf-gmp = 
-    {
-      pname = "conf-gmp";
-      version = "4";
-      src = null;
-      opamInputs = {
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/conf-gmp/conf-gmp.4";
-        hash = "sha256:0mcjm7kr6vhhyga9sliwkd9mixad5ipd7gjhmmq52rhvga33fap9";
-      };
-      buildInputs = [ (pkgs.gmp) ];
-    };
-    conf-gmp-powm-sec = 
-    {
-      pname = "conf-gmp-powm-sec";
-      version = "3";
-      src = null;
-      opamInputs = {
-                     inherit (selection) conf-gmp;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/conf-gmp-powm-sec/conf-gmp-powm-sec.3";
-        hash = "sha256:1q9c4av0ah791sq81yva4ga1mz5380r4260bjh060d3mzci00hd3";
-      };
-    };
-    conf-libcurl = 
-    {
-      pname = "conf-libcurl";
-      version = "2";
-      src = null;
-      opamInputs = {
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/conf-libcurl/conf-libcurl.2";
-        hash = "sha256:1mvxmqpjbx3jl1lppg6vwv22cn3kq446ihlgryb3ksas3d4c3qsp";
-      };
-      buildInputs = [ (pkgs.curl) ];
-    };
-    conf-libev = 
-    {
-      pname = "conf-libev";
-      version = "4-12";
-      src = null;
-      opamInputs = {
-                     inherit (selection) ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/conf-libev/conf-libev.4-12";
-        hash = "sha256:0cs307pi4a7qq6xxhlp881wj8wi7w5kzfkrvwwqv054wbiwx1gbw";
-      };
-      buildInputs = [ (pkgs.libev) ];
-    };
-    conf-pkg-config = 
-    {
-      pname = "conf-pkg-config";
-      version = "2";
-      src = null;
-      opamInputs = {
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/conf-pkg-config/conf-pkg-config.2";
-        hash = "sha256:1rli6809glz5g9xwp4wsjidc39za4n58xcpkamy6fymfnqha225n";
-      };
-      buildInputs = [ (pkgs.pkgconfig) ];
-    };
-    core = 
-    {
-      pname = "core";
-      version = "v0.15.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/core/archive/refs/tags/v0.15.1.tar.gz";
-        sha256 = "14f9vy2hfcvb5ixwwgnpdr6jdmbx29ig0cakli1gbwlp3pdbsyvg";
-      };
-      opamInputs = 
-      {
-        inherit (selection) variantslib typerep time_now stdio
-        splittable_random sexplib ppx_sexp_message ppx_sexp_conv ppx_jane
-        ppx_inline_test ppx_hash ppx_base ppx_assert ocaml jst-config
-        jane-street-headers fieldslib dune bin_prot base_quickcheck
-        base_bigstring base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/core/core.v0.15.1";
-        hash = "sha256:1nc4jfq4968p7zdm12g0fpzgjl139h34f076wxvl46wsgkl01lf2";
-      };
-    };
-    core_bench = 
-    {
-      pname = "core_bench";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/core_bench-v0.15.0.tar.gz";
-        sha256 = "0n2jaf62l7i5k48rm1z1kihypaq1qz3dyplda8fvmw1mbgkn9csx";
-      };
-      opamInputs = 
-      {
-        inherit (selection) textutils re ppx_sexp_conv ppx_let ppx_jane
-        ppx_fields_conv ppx_compare ocaml dune core_unix core_kernel core;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/core_bench/core_bench.v0.15.0";
-        hash = "sha256:0d1cjagwgxlrn2w60lnnmg3q7l678djcj8pgj09pbrbzvp5f5pww";
-      };
-    };
-    core_kernel = 
-    {
-      pname = "core_kernel";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/core_kernel-v0.15.0.tar.gz";
-        sha256 = "1h0na5sg2w6f923r3bqg64yhdmvpqrfcn5mdwj86nz022s7ji81l";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_jane ocaml int_repr dune core base-threads
-        base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/core_kernel/core_kernel.v0.15.0";
-        hash = "sha256:112n0nw2bjz03scwlrk6qabyxv3bmsxngl2jdpnijw01b2wc0yh3";
-      };
-    };
-    core_unix = 
-    {
-      pname = "core_unix";
-      version = "v0.15.2";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/core_unix/archive/refs/tags/v0.15.2.tar.gz";
-        sha256 = "0yznym5rr4f2z4swsjjlj84aql1yrkij7zdkh6h0z5h38sahwva8";
-      };
-      opamInputs = 
-      {
-        inherit (selection) timezone spawn sexplib ppx_jane ocaml_intrinsics
-        ocaml jst-config jane-street-headers expect_test_helpers_core dune
-        core_kernel core base-threads;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/core_unix/core_unix.v0.15.2";
-        hash = "sha256:0rvd00dy0f1drhadhirpjd6805p9nzd3daksjzappziigmv3lwb3";
-      };
-      buildInputs = [ (pkgs.linux-headers or null) ];
-    };
-    cppo = 
-    {
-      pname = "cppo";
-      version = "1.6.9";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml-community/cppo/archive/v1.6.9.tar.gz";
-        sha256 = "0sm2vn5y7w7fyrwkv7f86y4nvs5vsrqy1x2nidy0lcqxq62ns0qn";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml dune base-unix;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/cppo/cppo.1.6.9";
-        hash = "sha256:19i6yqv9lq09v3xw1sfqayh40sihhd4hfyvk9dwz1m5dv1g63xlp";
-      };
-    };
-    crowbar = 
-    {
-      pname = "crowbar";
-      version = "0.2.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/stedolan/crowbar/archive/v0.2.1.tar.gz";
-        sha256 = "095w44fk3p23axsl59dx1xxgwgz6xk4rmixdgy5xh3i3pxcfawsd";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocplib-endian ocaml dune cmdliner afl-persistent;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/crowbar/crowbar.0.2.1";
-        hash = "sha256:1vd2k2bq8c101ipbwpwymzknyl5zki0pfqbmxdkrhh8l4ii7dx0y";
-      };
-    };
-    csexp = 
-    {
-      pname = "csexp";
-      version = "1.5.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml-dune/csexp/releases/download/1.5.1/csexp-1.5.1.tbz";
-        sha256 = "00mc19f89pxpmjl62862ya5kjcfrl8rjzvs00j05h2m9bw3f81fn";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/csexp/csexp.1.5.1";
-        hash = "sha256:01lc95kz13gpki4xazyh6n20kv1g9inyb5myv240wl2n9v50z8fl";
-      };
-    };
-    cstruct = 
-    {
-      pname = "cstruct";
-      version = "6.1.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-cstruct/releases/download/v6.1.1/cstruct-6.1.1.tbz";
-        sha256 = "13aigx3bxa7ym66v22x17j574fjkvlb0fn94i40fczka1y3zjx0v";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml fmt dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/cstruct/cstruct.6.1.1";
-        hash = "sha256:1nvf73bn1bq75ijanzcljd23k6x4rfnh6jy9c0mvgm3a16cjan3c";
-      };
-    };
-    cstruct-lwt = 
-    {
-      pname = "cstruct-lwt";
-      version = "6.1.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-cstruct/releases/download/v6.1.1/cstruct-6.1.1.tbz";
-        sha256 = "13aigx3bxa7ym66v22x17j574fjkvlb0fn94i40fczka1y3zjx0v";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml lwt dune cstruct base-unix;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/cstruct-lwt/cstruct-lwt.6.1.1";
-        hash = "sha256:1936v5xfbxi9nc0j95d50qhbaz25zw2h2gcd2s7kvbi00aypbv7y";
-      };
-    };
-    cstruct-sexp = 
-    {
-      pname = "cstruct-sexp";
-      version = "6.1.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-cstruct/releases/download/v6.1.1/cstruct-6.1.1.tbz";
-        sha256 = "13aigx3bxa7ym66v22x17j574fjkvlb0fn94i40fczka1y3zjx0v";
-      };
-      opamInputs = 
-      {
-        inherit (selection) sexplib ocaml dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/cstruct-sexp/cstruct-sexp.6.1.1";
-        hash = "sha256:1ixcijv43pjn79x4zx93wvlhzyd8hljkb503vgl093myg7sq0dzi";
-      };
-    };
-    dns = 
-    {
-      pname = "dns";
-      version = "6.4.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-dns/releases/download/v6.4.0/dns-6.4.0.tbz";
-        sha256 = "0xb15l2qvf0m0k2waynx41mybz8jvvxbbsj26shnvmmzddb2siq0";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ptime ocaml metrics lru logs ipaddr gmap fmt
-        duration dune domain-name cstruct base64;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/dns/dns.6.4.0";
-        hash = "sha256:0kpywrmrcwrbw9x1q8kz5sijlhbkygrjxxcb12nqqs808cmcr9zy";
-      };
-    };
-    dns-client = 
-    {
-      pname = "dns-client";
-      version = "6.4.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-dns/releases/download/v6.4.0/dns-6.4.0.tbz";
-        sha256 = "0xb15l2qvf0m0k2waynx41mybz8jvvxbbsj26shnvmmzddb2siq0";
-      };
-      opamInputs = 
-      {
-        inherit (selection) x509 tls-mirage tls tcpip randomconv ocaml mtime
-        mirage-time mirage-random mirage-crypto-rng mirage-clock lwt logs
-        ipaddr happy-eyeballs fmt dune domain-name dns cstruct ca-certs-nss
-        ca-certs;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/dns-client/dns-client.6.4.0";
-        hash = "sha256:1pjqpmbx4n9q4r983276xfgrmcrh11c41d6nkd9h13dcw3kz5zry";
-      };
-    };
-    domain-name = 
-    {
-      pname = "domain-name";
-      version = "0.4.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/hannesm/domain-name/releases/download/v0.4.0/domain-name-0.4.0.tbz";
-        sha256 = "1i8846nw81w0dkd76y0a3jw1sk9734qgw4p8fccj15aqhhi6xh55";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/domain-name/domain-name.0.4.0";
-        hash = "sha256:1m9bf04jaqqj67vs6k14q1a46gis95lgzs6vjcfj3cq2j7xj5x0c";
-      };
-    };
-    dune = 
-    {
-      pname = "dune";
-      version = "3.5.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml/dune/releases/download/3.5.0/dune-3.5.0.tbz";
-        sha256 = "041n16sn41wwj6fgi7l10hvbl5x5swygqv33d4csx7rm0iklrgbp";
-      };
-      opamInputs = 
-      {
-        inherit (selection) base-unix
-        base-threads;
-        ocamlfind-secondary = selection.ocamlfind-secondary or null;
-        ocaml = selection.ocaml or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/dune/dune.3.5.0";
-        hash = "sha256:1wpf5apqawl722ivj75rbfjd67y6lrbpwcjsyd7y3bhd1ayqdpcc";
-      };
-    };
-    dune-build-info = 
-    {
-      pname = "dune-build-info";
-      version = "3.5.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml/dune/releases/download/3.5.0/dune-3.5.0.tbz";
-        sha256 = "041n16sn41wwj6fgi7l10hvbl5x5swygqv33d4csx7rm0iklrgbp";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/dune-build-info/dune-build-info.3.5.0";
-        hash = "sha256:12xpk9v0l1af9najxlaaf522yyxs1b8wx1nz5awcmicfas2gbpci";
-      };
-    };
-    dune-configurator = 
-    {
-      pname = "dune-configurator";
-      version = "3.5.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml/dune/releases/download/3.5.0/dune-3.5.0.tbz";
-        sha256 = "041n16sn41wwj6fgi7l10hvbl5x5swygqv33d4csx7rm0iklrgbp";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml dune csexp base-unix;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/dune-configurator/dune-configurator.3.5.0";
-        hash = "sha256:19msm9zg7276yky508rkii0xd7i3297aqi01z5vfx680c0vzqddr";
-      };
-    };
-    duration = 
-    {
-      pname = "duration";
-      version = "0.2.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/hannesm/duration/releases/download/v0.2.1/duration-0.2.1.tbz";
-        sha256 = "0aqyqzkrkkn33jysq3nmy0l24jyy37wdvlqw286856gvikrw2f67";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/duration/duration.0.2.1";
-        hash = "sha256:1d7922cvnnccck7kr2dss0d922f17nxsqhygszw5hn5xyirldbpy";
-      };
-    };
-    either = 
-    {
-      pname = "either";
-      version = "1.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/either/releases/download/1.0.0/either-1.0.0.tbz";
-        sha256 = "112qa1zdkf4mvn6932jb2rwxdcvfm7lg2zgh2mr7pvid67ilsrxz";
-      };
-      opamInputs = {
-                     inherit (selection) dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/either/either.1.0.0";
-        hash = "sha256:1qcj3zl0hjlc4djn5q6qjiagm5xq1q1vgbshwlf4gj7h7kzx11bf";
-      };
-    };
-    eqaf = 
-    {
-      pname = "eqaf";
-      version = "0.9";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/eqaf/releases/download/v0.9/eqaf-0.9.tbz";
-        sha256 = "1q6zanrbj0ddrxwhwqdv1223mbk1k5dg0m2qbpwifs5c8sljh3pc";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/eqaf/eqaf.0.9";
-        hash = "sha256:12yfvhy9n7qmfy8z6ppz15s13n9l3n0pqpyqms5kalqwcfnxaf7i";
-      };
-    };
-    ethernet = 
-    {
-      pname = "ethernet";
-      version = "3.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ethernet/releases/download/v3.0.0/ethernet-v3.0.0.tbz";
-        sha256 = "0a898vp9dw42majsvzzvs8pc6x4ns01wlwhwbacixliv6vv78ng9";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_cstruct ocaml mirage-profile mirage-net
-        macaddr lwt logs dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ethernet/ethernet.3.0.0";
-        hash = "sha256:1ibjzls4n2ab78mf7lhs6lz7n3zk7v6ylzzp9a8b6d9mgwcfry44";
-      };
-    };
-    expect_test_helpers_core = 
-    {
-      pname = "expect_test_helpers_core";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/expect_test_helpers_core-v0.15.0.tar.gz";
-        sha256 = "0llnzx90qp1yydx4rg3fgd29wqfi92jrsvw1pp434gi5cj2p6akz";
-      };
-      opamInputs = 
-      {
-        inherit (selection) stdio sexp_pretty re ppx_jane ocaml dune core
-        base_quickcheck base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/expect_test_helpers_core/expect_test_helpers_core.v0.15.0";
-        hash = "sha256:00ff3q9yc3cz2azaqjvdq615s0zzx7sab5z7s80jk1mzpa041zwn";
-      };
-    };
-    fieldslib = 
-    {
-      pname = "fieldslib";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/fieldslib-v0.15.0.tar.gz";
-        sha256 = "083izf854vzmi5zj63r7ipjf09y1dqf7iy8n6r4663444xrzs2h5";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/fieldslib/fieldslib.v0.15.0";
-        hash = "sha256:0h80yc0k983q2kxbg60xd7rm84xlp9hpnwnqq8q0w5csc7vpn6cc";
-      };
-    };
-    fix = 
-    {
-      pname = "fix";
-      version = "20220121";
-      src = pkgs.fetchurl 
-      {
-        url = "https://gitlab.inria.fr/fpottier/fix/-/archive/20220121/archive.tar.gz";
-        sha256 = "1bd8xnk3qf7nfsmk3z6hksvcascndbl7pp2a50ndj8hzf7hdnfwm";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/fix/fix.20220121";
-        hash = "sha256:1b77pgcxl0ra4z28vg4azr3rraq5caaind4xz5yn4c4grkhv6nrw";
-      };
-    };
-    fmt = 
-    {
-      pname = "fmt";
-      version = "0.9.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/fmt/releases/fmt-0.9.0.tbz";
-        sha256 = "0q8j2in2473xh7k4hfgnppv9qy77f2ih89yp6yhpbp92ba021yzi";
-      };
-      opamInputs = 
-      {
-        inherit (selection) topkg ocamlfind ocamlbuild
-        ocaml;
-        cmdliner = selection.cmdliner or null;
-        base-unix = selection.base-unix or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/fmt/fmt.0.9.0";
-        hash = "sha256:1czh5i3i4mkf9xfasji3v7n821qmnnandlklh67ali0x87brldny";
-      };
-    };
-    fpath = 
-    {
-      pname = "fpath";
-      version = "0.7.3";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/fpath/releases/fpath-0.7.3.tbz";
-        sha256 = "03z7mj0sqdz465rc4drj1gr88l9q3nfs374yssvdjdyhjbqqzc0j";
-      };
-      opamInputs = 
-      {
-        inherit (selection) topkg ocamlfind ocamlbuild ocaml astring;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/fpath/fpath.0.7.3";
-        hash = "sha256:1pnskgw9fqq4kg1x4sc4vcv9rh0kksilx4qngwafpyss42mqq2i2";
-      };
-    };
-    gmap = 
-    {
-      pname = "gmap";
-      version = "0.3.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/hannesm/gmap/releases/download/0.3.0/gmap-0.3.0.tbz";
-        sha256 = "073wa0lrb0jj706j87cwzf1a8d1ff14100mnrjs8z3xc4ri9xp84";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/gmap/gmap.0.3.0";
-        hash = "sha256:1zibwnms9pyvqqchh5mzd48hq32hrs8qcqbai9jwbydnn805ahq5";
-      };
-    };
-    happy-eyeballs = 
-    {
-      pname = "happy-eyeballs";
-      version = "0.3.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/roburio/happy-eyeballs/releases/download/v0.3.0/happy-eyeballs-0.3.0.tbz";
-        sha256 = "17mnid1gvq1ml1zmqzn0m6jmrqw4kqdrjqrdsrphl5kxxyhs03m6";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml logs ipaddr fmt duration dune domain-name;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/happy-eyeballs/happy-eyeballs.0.3.0";
-        hash = "sha256:09d825s9qmvg15mkvx6sc7hx1pz0kqax4kqxjjglzbzm8bk7sxpz";
-      };
-    };
-    hkdf = 
-    {
-      pname = "hkdf";
-      version = "1.0.4";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/hannesm/ocaml-hkdf/releases/download/v1.0.4/hkdf-v1.0.4.tbz";
-        sha256 = "0nzx6vzbc1hh6vx1ly8df4b16lgps6zjpp9mjycsnnn49bddc9mr";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml mirage-crypto dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/hkdf/hkdf.1.0.4";
-        hash = "sha256:03wcvwhzxipf71aqsh77ly8iygqd6f0pwy04pcga58rifgiys5m2";
-      };
-    };
-    http = 
-    {
-      pname = "http";
-      version = "development";
-      src = self.directSrc "http";
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = "http.opam";
-    };
-    int_repr = 
-    {
-      pname = "int_repr";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/int_repr-v0.15.0.tar.gz";
-        sha256 = "06b7xp0v3s1jmf1bkjj2dyiwmk3ffbyglb1g8f1s3jjbj5c7ndax";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_jane ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/int_repr/int_repr.v0.15.0";
-        hash = "sha256:1l5fkljdys8cd6wca7vwsgnmiqj12kgirlsx09j3y49w2w0y35ag";
-      };
-    };
-    io-page = 
-    {
-      pname = "io-page";
-      version = "3.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/io-page/releases/download/v3.0.0/io-page-3.0.0.tbz";
-        sha256 = "1vl6ywzp48180bmdnk1zprwz0amz5sxrijwhh08acsq5v5scldhf";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml dune cstruct
-        conf-pkg-config;
-        ocaml-freestanding = selection.ocaml-freestanding or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/io-page/io-page.3.0.0";
-        hash = "sha256:15985yr1dn6qrsfjwjdmcmagyyn0nrvjpwk3l18nwiqz2dpqspkm";
-      };
-    };
-    ipaddr = 
-    {
-      pname = "ipaddr";
-      version = "5.3.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-ipaddr/releases/download/v5.3.1/ipaddr-5.3.1.tbz";
-        sha256 = "1m77j7qs4hab8rzib7f28y7pr2a4l3wv49py4ag6svnvraybq84q";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml macaddr dune domain-name;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ipaddr/ipaddr.5.3.1";
-        hash = "sha256:13la3x8qspl5mzwhf33a04lnacj9k1b8jgracd71arj2y4lc3afr";
-      };
-    };
-    ipaddr-sexp = 
-    {
-      pname = "ipaddr-sexp";
-      version = "5.3.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-ipaddr/releases/download/v5.3.1/ipaddr-5.3.1.tbz";
-        sha256 = "1m77j7qs4hab8rzib7f28y7pr2a4l3wv49py4ag6svnvraybq84q";
-      };
-      opamInputs = 
-      {
-        inherit (selection) sexplib0 ppx_sexp_conv ocaml ipaddr dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ipaddr-sexp/ipaddr-sexp.5.3.1";
-        hash = "sha256:1chyb5fhnm54a4fyrpag18h8mi0hd0kn3q6ds6ml3zz2g6sqb0am";
-      };
-    };
-    jane-street-headers = 
-    {
-      pname = "jane-street-headers";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/jane-street-headers-v0.15.0.tar.gz";
-        sha256 = "1r27r0bxxa0iaah5rm84lwhrmh784vfpmb6056hpv0p34rxs7r1l";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/jane-street-headers/jane-street-headers.v0.15.0";
-        hash = "sha256:134qp5ww1ws8k9i43sr13ivibsz88si142cdkllrcw9ib9d4aa5g";
-      };
-    };
-    js_of_ocaml = 
-    {
-      pname = "js_of_ocaml";
-      version = "4.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocsigen/js_of_ocaml/releases/download/4.0.0/js_of_ocaml-4.0.0.tbz";
-        sha256 = "0pj9jjrmi0xxrzmygv4b5whsibw1jxy3wgibmws85x5jwlczh0nz";
-      };
-      opamInputs = 
-      {
-        inherit (selection) uchar ppxlib ocaml js_of_ocaml-compiler dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/js_of_ocaml/js_of_ocaml.4.0.0";
-        hash = "sha256:0krl3wlgld1ibpy5bivygw060578kxvk81wnipnnsc92drpk5nyk";
-      };
-    };
-    js_of_ocaml-compiler = 
-    {
-      pname = "js_of_ocaml-compiler";
-      version = "4.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocsigen/js_of_ocaml/releases/download/4.0.0/js_of_ocaml-4.0.0.tbz";
-        sha256 = "0pj9jjrmi0xxrzmygv4b5whsibw1jxy3wgibmws85x5jwlczh0nz";
-      };
-      opamInputs = 
-      {
-        inherit (selection) yojson ppxlib ocaml menhirSdk menhirLib menhir
-        dune cmdliner;
-        ocamlfind = selection.ocamlfind or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/js_of_ocaml-compiler/js_of_ocaml-compiler.4.0.0";
-        hash = "sha256:168fq44ndm268374152w39x9pa351h8ddz3xgada46s9sw0qa2n6";
-      };
-    };
-    js_of_ocaml-lwt = 
-    {
-      pname = "js_of_ocaml-lwt";
-      version = "4.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocsigen/js_of_ocaml/releases/download/4.0.0/js_of_ocaml-4.0.0.tbz";
-        sha256 = "0pj9jjrmi0xxrzmygv4b5whsibw1jxy3wgibmws85x5jwlczh0nz";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml lwt js_of_ocaml-ppx js_of_ocaml
-        dune;
-        lwt_log = selection.lwt_log or null;
-        graphics = selection.graphics or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/js_of_ocaml-lwt/js_of_ocaml-lwt.4.0.0";
-        hash = "sha256:1ap4nrdmc20bihglfykfxgjl3nf5p9hlcnd6z6ma81g410akpn3b";
-      };
-    };
-    js_of_ocaml-ppx = 
-    {
-      pname = "js_of_ocaml-ppx";
-      version = "4.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocsigen/js_of_ocaml/releases/download/4.0.0/js_of_ocaml-4.0.0.tbz";
-        sha256 = "0pj9jjrmi0xxrzmygv4b5whsibw1jxy3wgibmws85x5jwlczh0nz";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml js_of_ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/js_of_ocaml-ppx/js_of_ocaml-ppx.4.0.0";
-        hash = "sha256:0qccn6vv70ig56dw4iyqmk2jmvgdyl81cxcwrkml7fbk5mcvn513";
-      };
-    };
-    jst-config = 
-    {
-      pname = "jst-config";
-      version = "v0.15.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/jst-config/archive/refs/tags/v0.15.1.tar.gz";
-        sha256 = "06xlyg0cyvv742haypdjbl82b5h5mla9hhcg3q67csq1nfxyalvh";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_assert ocaml dune-configurator dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/jst-config/jst-config.v0.15.1";
-        hash = "sha256:03px4smpvwvqcvdn38jyjcfb2q41qpcgcyi8pj9ig7a76hzm5hrv";
-      };
-    };
-    logs = 
-    {
-      pname = "logs";
-      version = "0.7.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/logs/releases/logs-0.7.0.tbz";
-        sha256 = "1jnmd675wmsmdwyb5mx5b0ac66g4c6gpv5s4mrx2j6pb0wla1x46";
-      };
-      opamInputs = 
-      {
-        inherit (selection) topkg ocamlfind ocamlbuild
-        ocaml;
-        lwt = selection.lwt or null;
-        js_of_ocaml = selection.js_of_ocaml or null;
-        fmt = selection.fmt or null;
-        cmdliner = selection.cmdliner or null;
-        base-threads = selection.base-threads or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/logs/logs.0.7.0";
-        hash = "sha256:0pys6d25bghrwvwd4gflib2yyp5fvdy0rkivbdyli5dmp5j35a3n";
-      };
-    };
-    lru = 
-    {
-      pname = "lru";
-      version = "0.3.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/pqwy/lru/releases/download/v0.3.1/lru-0.3.1.tbz";
-        sha256 = "1z9nnba2b4q0q0syyqk4790hzxs71la8h2wwhr7j8nvxgb927gkc";
-      };
-      opamInputs = {
-                     inherit (selection) psq ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/lru/lru.0.3.1";
-        hash = "sha256:0g1gp7p8hzw84cdnmwdyvc2bcpjg06sb86fmmmq2sc6qkxs7hnif";
-      };
-    };
-    lwt = 
-    {
-      pname = "lwt";
-      version = "5.6.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocsigen/lwt/archive/5.6.1.tar.gz";
-        sha256 = "1837iagnba58018ag82c9lwaby01c031547n08jjyj8q5q6lfjgb";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocplib-endian ocaml dune-configurator dune
-        cppo;
-        conf-libev = selection.conf-libev or null;
-        base-unix = selection.base-unix or null;
-        base-threads = selection.base-threads or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/lwt/lwt.5.6.1";
-        hash = "sha256:0y6rif2d9ggd7mwv4hipawn8jjfn4vdk57i6zld2izqpj6f6m9kc";
-      };
-    };
-    lwt-dllist = 
-    {
-      pname = "lwt-dllist";
-      version = "1.0.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/lwt-dllist/releases/download/v1.0.1/lwt-dllist-v1.0.1.tbz";
-        sha256 = "0vms1py6qh0k8vi6n4wnmrfwpi44a4gfgcpq9i8m23gh81gffv78";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/lwt-dllist/lwt-dllist.1.0.1";
-        hash = "sha256:0ygfjbnsmjq78qg26iq1vkhgcmj5gg4mi2nhalcgbz8imm1wlhpf";
-      };
-    };
-    lwt_ppx = 
-    {
-      pname = "lwt_ppx";
-      version = "2.1.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocsigen/lwt/archive/5.6.0.tar.gz";
-        sha256 = "1qg5wjlmrnd295lljncr1db1rw50pr13wmak3rcg92n9wd1fzm0v";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml lwt dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/lwt_ppx/lwt_ppx.2.1.0";
-        hash = "sha256:09kc2bwmqq41983xivild7az3s62nrhp62iinvc2b6lpcldzvqqc";
-      };
-    };
-    macaddr = 
-    {
-      pname = "macaddr";
-      version = "5.3.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-ipaddr/releases/download/v5.3.1/ipaddr-5.3.1.tbz";
-        sha256 = "1m77j7qs4hab8rzib7f28y7pr2a4l3wv49py4ag6svnvraybq84q";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/macaddr/macaddr.5.3.1";
-        hash = "sha256:0y77dl6fhxnz0gz3idzjmf13wcbssn8b6j1mngbra1bnm9sj68k8";
-      };
-    };
-    macaddr-cstruct = 
-    {
-      pname = "macaddr-cstruct";
-      version = "5.3.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-ipaddr/releases/download/v5.3.1/ipaddr-5.3.1.tbz";
-        sha256 = "1m77j7qs4hab8rzib7f28y7pr2a4l3wv49py4ag6svnvraybq84q";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml macaddr dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/macaddr-cstruct/macaddr-cstruct.5.3.1";
-        hash = "sha256:02gy6cpsid0gjlffwwgd1ack9zjnfm2vppmkz2bijzkvs5w8yssj";
-      };
-    };
-    magic-mime = 
-    {
-      pname = "magic-mime";
-      version = "1.2.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-magic-mime/releases/download/v1.2.0/magic-mime-v1.2.0.tbz";
-        sha256 = "1xcl0si6zgczfx1788y0qm5wir15fcfd1mczzki9gpgq01svc8gi";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/magic-mime/magic-mime.1.2.0";
-        hash = "sha256:0cd3l2cjh2rlvp1r9l5fb0jxhn5176qjw042py9xq999zp09kp21";
-      };
-    };
-    menhir = 
-    {
-      pname = "menhir";
-      version = "20220210";
-      src = pkgs.fetchurl 
-      {
-        url = "https://gitlab.inria.fr/fpottier/menhir/-/archive/20220210/archive.tar.gz";
-        sha256 = "0dapvzw55y9ggadh7ahya22s6r972c2n2nx6jsw5437ryldfi92p";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml menhirSdk menhirLib dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/menhir/menhir.20220210";
-        hash = "sha256:161aag5brwpllfd2g9fh1z6fnw9g644i7nrjv1plg2w9ggkp76cx";
-      };
-    };
-    menhirLib = 
-    {
-      pname = "menhirLib";
-      version = "20220210";
-      src = pkgs.fetchurl 
-      {
-        url = "https://gitlab.inria.fr/fpottier/menhir/-/archive/20220210/archive.tar.gz";
-        sha256 = "0dapvzw55y9ggadh7ahya22s6r972c2n2nx6jsw5437ryldfi92p";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/menhirLib/menhirLib.20220210";
-        hash = "sha256:1wxm1hky6qmspqd3s7fqvjghimh5zwhrpx3a9qijxz809z8sgn1s";
-      };
-    };
-    menhirSdk = 
-    {
-      pname = "menhirSdk";
-      version = "20220210";
-      src = pkgs.fetchurl 
-      {
-        url = "https://gitlab.inria.fr/fpottier/menhir/-/archive/20220210/archive.tar.gz";
-        sha256 = "0dapvzw55y9ggadh7ahya22s6r972c2n2nx6jsw5437ryldfi92p";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/menhirSdk/menhirSdk.20220210";
-        hash = "sha256:1q5snh164k3hdq57rrbay2cz9052bjz8r2vmqfawd978izgm8iyv";
-      };
-    };
-    metrics = 
-    {
-      pname = "metrics";
-      version = "0.4.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/metrics/releases/download/v0.4.0/metrics-0.4.0.tbz";
-        sha256 = "1bw9wdzmw6xxhaww95xayias1mmypqcmkdf32cbkg42h9dd7bf4i";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml fmt dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/metrics/metrics.0.4.0";
-        hash = "sha256:0x5k97bi7ifhama4w50jv929hs8kccdflppd1yf4cd6v17glyamw";
-      };
-    };
-    mirage-channel = 
-    {
-      pname = "mirage-channel";
-      version = "4.1.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-channel/releases/download/v4.1.0/mirage-channel-4.1.0.tbz";
-        sha256 = "0011lzyxkwz3bwcb2cqbll707rkqh48j1d3jf26rgxfxsi8nh5xh";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml mirage-flow lwt logs dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-channel/mirage-channel.4.1.0";
-        hash = "sha256:1z6wzkx0rshhiwmhv57z0dvns96i5cj7gsnj8981k90m7qq4pkl6";
-      };
-    };
-    mirage-clock = 
-    {
-      pname = "mirage-clock";
-      version = "4.2.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-clock/releases/download/v4.2.0/mirage-clock-4.2.0.tbz";
-        sha256 = "0iwqi2381fbi3jlcw424dbhjs4fpisw7qpqzfjx7jg72bdfx25zs";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-clock/mirage-clock.4.2.0";
-        hash = "sha256:17zha0ciapnnp83n1mj8nw98pm4m4s0hmbhrs3z6ymllfb70s05q";
-      };
-    };
-    mirage-crypto = 
-    {
-      pname = "mirage-crypto";
-      version = "0.10.7";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-crypto/releases/download/v0.10.7/mirage-crypto-0.10.7.tbz";
-        sha256 = "1756i2wnx0sga86nhnqhw02dv9yjrnql6svv9il5np131iv8m09y";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml eqaf dune-configurator dune cstruct
-        conf-pkg-config;
-        ocaml-freestanding = selection.ocaml-freestanding or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-crypto/mirage-crypto.0.10.7";
-        hash = "sha256:1zivqg1kv0hm1xcaqcjwqqmn9ivvacyi7y3iyr2629ayjl8bmimp";
-      };
-    };
-    mirage-crypto-ec = 
-    {
-      pname = "mirage-crypto-ec";
-      version = "0.10.7";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-crypto/releases/download/v0.10.7/mirage-crypto-0.10.7.tbz";
-        sha256 = "1756i2wnx0sga86nhnqhw02dv9yjrnql6svv9il5np131iv8m09y";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml mirage-crypto-rng mirage-crypto eqaf
-        dune-configurator dune cstruct
-        conf-pkg-config;
-        ocaml-freestanding = selection.ocaml-freestanding or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-crypto-ec/mirage-crypto-ec.0.10.7";
-        hash = "sha256:1sn2gif1hzl58yql8w7m4pff5kirgm1jbx96abjj25k64csgysqc";
-      };
-    };
-    mirage-crypto-pk = 
-    {
-      pname = "mirage-crypto-pk";
-      version = "0.10.7";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-crypto/releases/download/v0.10.7/mirage-crypto-0.10.7.tbz";
-        sha256 = "1756i2wnx0sga86nhnqhw02dv9yjrnql6svv9il5np131iv8m09y";
-      };
-      opamInputs = 
-      {
-        inherit (selection) zarith sexplib0 ocaml mirage-crypto-rng
-        mirage-crypto eqaf dune cstruct
-        conf-gmp-powm-sec;
-        zarith-freestanding = selection.zarith-freestanding or null;
-        mirage-runtime = selection.mirage-runtime or null;
-        mirage-no-xen = selection.mirage-no-xen or null;
-        mirage-no-solo5 = selection.mirage-no-solo5 or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-crypto-pk/mirage-crypto-pk.0.10.7";
-        hash = "sha256:1b2d5zkxckzknmsih1sddqpvhjxwbg9z502awgr1sksjfwrw7prg";
-      };
-    };
-    mirage-crypto-rng = 
-    {
-      pname = "mirage-crypto-rng";
-      version = "0.10.7";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-crypto/releases/download/v0.10.7/mirage-crypto-0.10.7.tbz";
-        sha256 = "1756i2wnx0sga86nhnqhw02dv9yjrnql6svv9il5np131iv8m09y";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml mtime mirage-crypto lwt logs duration
-        dune-configurator dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-crypto-rng/mirage-crypto-rng.0.10.7";
-        hash = "sha256:1p43ics1m2mc7zpgiglgzf97ss7cfipdkjv43rr0yq81hj65y2rb";
-      };
-    };
-    mirage-flow = 
-    {
-      pname = "mirage-flow";
-      version = "3.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-flow/releases/download/v3.0.0/mirage-flow-v3.0.0.tbz";
-        sha256 = "1z1qc5lr2lmy0w43z4cj7d810a4x4rgxki4bv2z4f9zchmndl2yp";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml lwt fmt dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-flow/mirage-flow.3.0.0";
-        hash = "sha256:0pmhxnpr7zvlba69ib9vclpmp07m6qfndx6wq3x2wj8nfgyx17s4";
-      };
-    };
-    mirage-flow-combinators = 
-    {
-      pname = "mirage-flow-combinators";
-      version = "3.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-flow/releases/download/v3.0.0/mirage-flow-v3.0.0.tbz";
-        sha256 = "1z1qc5lr2lmy0w43z4cj7d810a4x4rgxki4bv2z4f9zchmndl2yp";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml mirage-flow mirage-clock lwt logs fmt dune
-        cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-flow-combinators/mirage-flow-combinators.3.0.0";
-        hash = "sha256:02i62mscym51qqm5hfslrf77cyimadjv6kjn2021fr78qf3wyal6";
-      };
-    };
-    mirage-kv = 
-    {
-      pname = "mirage-kv";
-      version = "5.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-kv/releases/download/v5.0.0/mirage-kv-5.0.0.tbz";
-        sha256 = "0qjl73v4jzsa3mayxabg0lxf1rjv9bwwqclyip51f426j91xfdhh";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml lwt fmt dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-kv/mirage-kv.5.0.0";
-        hash = "sha256:1nhyawncmwbd75zmj2dn7j3p4aqf8haz3py25k9mggxxl4dw9871";
-      };
-    };
-    mirage-net = 
-    {
-      pname = "mirage-net";
-      version = "4.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-net/releases/download/v4.0.0/mirage-net-v4.0.0.tbz";
-        sha256 = "1kllw58f41qqjnl3iwvz748zk7xqvcahr1sh4jrhl6mqhz8zz3k6";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml macaddr lwt fmt dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-net/mirage-net.4.0.0";
-        hash = "sha256:1g7285bp2ncbd575r54p4algjykfqchlv6z9476gxvylxl1ncj6a";
-      };
-    };
-    mirage-no-solo5 = 
-    {
-      pname = "mirage-no-solo5";
-      version = "1";
-      src = null;
-      opamInputs = {
-                     inherit (selection) ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-no-solo5/mirage-no-solo5.1";
-        hash = "sha256:18h50v7lp39sis6jy46h35vij0v1z5fr76c4y2h4b72c40fwwck1";
-      };
-    };
-    mirage-no-xen = 
-    {
-      pname = "mirage-no-xen";
-      version = "1";
-      src = null;
-      opamInputs = {
-                     inherit (selection) ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-no-xen/mirage-no-xen.1";
-        hash = "sha256:1nvmvay3nkl8ljw9f46dwv3jppqbbkp0pxf9f1gq4spckb8ysmkh";
-      };
-    };
-    mirage-profile = 
-    {
-      pname = "mirage-profile";
-      version = "0.9.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-profile/releases/download/v0.9.1/mirage-profile-v0.9.1.tbz";
-        sha256 = "0lh3591ad4v7nxpd410b75idmgdq668mqdilvkg4avrwqw1wzdib";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_cstruct ocplib-endian ocaml lwt dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-profile/mirage-profile.0.9.1";
-        hash = "sha256:02gvd3f914s22r3ckpiqyq345fq5vk097brg2zwzfxljibzz94q2";
-      };
-    };
-    mirage-random = 
-    {
-      pname = "mirage-random";
-      version = "3.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-random/releases/download/v3.0.0/mirage-random-v3.0.0.tbz";
-        sha256 = "1kv6800zl06hymj0jpydhffv5sdqr5zy9azc4cbwqc343ll3zzj9";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-random/mirage-random.3.0.0";
-        hash = "sha256:0w3577cghv5r8c6qi9d7fbjry7ghavi44k2cn3zf2kwy3qml5n51";
-      };
-    };
-    mirage-time = 
-    {
-      pname = "mirage-time";
-      version = "3.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-time/releases/download/v3.0.0/mirage-time-v3.0.0.tbz";
-        sha256 = "0z5xkhlgyhm22wyhwpf9r0rn4125cc3cxj6ccavyiiz2b2dr8h0d";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml lwt dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mirage-time/mirage-time.3.0.0";
-        hash = "sha256:1vk2ibpgrxq8njwwqbhznq7zxvwvifp0dracs90drrqikzykdm0d";
-      };
-    };
-    mtime = 
-    {
-      pname = "mtime";
-      version = "1.4.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/mtime/releases/mtime-1.4.0.tbz";
-        sha256 = "1xy6lg52n2zynp4p164ym9j0f1b95j5n4bi5y4mbdrry9w99h32m";
-      };
-      opamInputs = 
-      {
-        inherit (selection) topkg ocamlfind ocamlbuild ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/mtime/mtime.1.4.0";
-        hash = "sha256:128s1c15kvbpgx046m4yi8dvjjj0v852wrvd2ii8z4rqgi56hkcs";
-      };
-    };
-    num = 
-    {
-      pname = "num";
-      version = "1.4";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml/num/archive/v1.4.tar.gz";
-        sha256 = "090gl27g84r3s2b12vgkz8fp269jqlrhx4lpg7008yviisv8hl01";
-      };
-      opamInputs = {
-                     inherit (selection) ocamlfind ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/num/num.1.4";
-        hash = "sha256:0q683bfsbw9k3vzzxpnjv2sgjdas97aybqz19acnm14ihnalbzm2";
-      };
-    };
-    ocaml = 
-    {
-      pname = "ocaml";
-      version = "4.14.0";
-      src = null;
-      opamInputs = 
-      {
-        inherit (selection)
-        ocaml-config;
-        ocaml-variants = selection.ocaml-variants or null;
-        ocaml-system = selection.ocaml-system or null;
-        ocaml-base-compiler = selection.ocaml-base-compiler or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocaml/ocaml.4.14.0";
-        hash = "sha256:1p4i6fpw1psp5izwcdswcilkkzicdm33mwzg5hhm2cqn85784hmq";
-      };
-    };
-    ocaml-base-compiler = 
-    {
-      pname = "ocaml-base-compiler";
-      version = "4.14.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml/ocaml/archive/4.14.0.tar.gz";
-        sha256 = "1s2ml56m8i43jgvr59vx09javdrwfps8p7az9h2x2a1g71h45x1r";
-      };
-      opamInputs = {
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocaml-base-compiler/ocaml-base-compiler.4.14.0";
-        hash = "sha256:0xpg8jgynv4a7frdbiry3qphmd63ps35cr932vx5nya3pgw3mnvk";
-      };
-    };
-    ocaml-compiler-libs = 
-    {
-      pname = "ocaml-compiler-libs";
-      version = "v0.12.4";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/ocaml-compiler-libs/releases/download/v0.12.4/ocaml-compiler-libs-v0.12.4.tbz";
-        sha256 = "0q3pl20pkx410gw9g4m26qq6dmzi9qan2dqlga6c2ifc6pnckjaf";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocaml-compiler-libs/ocaml-compiler-libs.v0.12.4";
-        hash = "sha256:1blynia10j8vyj559kcvc7ic69zq6qjjn092fcsjzfw6czd8ya2c";
-      };
-    };
-    ocaml-config = 
-    {
-      pname = "ocaml-config";
-      version = "2";
-      src = null;
-      opamInputs = 
-      {
-        ocaml-variants = selection.ocaml-variants or null;
-        ocaml-system = selection.ocaml-system or null;
-        ocaml-base-compiler = selection.ocaml-base-compiler or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocaml-config/ocaml-config.2";
-        hash = "sha256:0h0hgqq9mbywvqygppfdc50gf9ss8a97l4dgsv3hszmzh6gglgrg";
-      };
-    };
-    ocaml-syntax-shims = 
-    {
-      pname = "ocaml-syntax-shims";
-      version = "1.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml-ppx/ocaml-syntax-shims/releases/download/1.0.0/ocaml-syntax-shims-1.0.0.tbz";
-        sha256 = "1j7848khli4p7j8i2kmnvhdnhcwhy3zgdpf5ds5ic30ax69y3cl9";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocaml-syntax-shims/ocaml-syntax-shims.1.0.0";
-        hash = "sha256:0qnm1db0298yqcn6j9fmb0l4gr5nhcar8plskj39917invyamgd2";
-      };
-    };
-    ocaml-version = 
-    {
-      pname = "ocaml-version";
-      version = "3.5.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocurrent/ocaml-version/releases/download/v3.5.0/ocaml-version-3.5.0.tbz";
-        sha256 = "0nv3gwphxxccnzladil7c8bw1ri3wvdbyxkigw2i8sqdjz1s2g6n";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocaml-version/ocaml-version.3.5.0";
-        hash = "sha256:1fm4da5p534w8xv4c49r21ppb4s18gdqnj2qvqzn1c9l86aal1dw";
-      };
-    };
-    ocaml_intrinsics = 
-    {
-      pname = "ocaml_intrinsics";
-      version = "v0.15.2";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/ocaml_intrinsics/archive/refs/tags/v0.15.2.tar.gz";
-        sha256 = "1jm5bjgbdhlkna7x7di975f50l4n1bnanaad9za585mzrrzll1lj";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml dune-configurator dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocaml_intrinsics/ocaml_intrinsics.v0.15.2";
-        hash = "sha256:156lpv9z7fzavvgxzqwbv7rz1ay4ffdzwqka6gaghx8phbnl223y";
-      };
-    };
-    ocamlbuild = 
-    {
-      pname = "ocamlbuild";
-      version = "0.14.2";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml/ocamlbuild/archive/refs/tags/0.14.2.tar.gz";
-        sha256 = "1ccihx2jnk3nsprx2w2kckqqq0bd0skq9i9sm01cg53p0fvdmlk2";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocamlbuild/ocamlbuild.0.14.2";
-        hash = "sha256:0l3lc0z5bzlmsndqv8ylwwzq0p2idzkbwmrrsfkngxh3kls2c5xy";
-      };
-    };
-    ocamlfind = 
-    {
-      pname = "ocamlfind";
-      version = "1.9.5";
-      src = pkgs.fetchurl 
-      {
-        url = "http://download.camlcity.org/download/findlib-1.9.5.tar.gz";
-        sha256 = "0w9578j1561f5gi51sn2jgxm3kh3sn88cpannhdkqcdg1kk08iqd";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml;
-        graphics = selection.graphics or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocamlfind/ocamlfind.1.9.5";
-        hash = "sha256:028mi76rmi831jkpffphshyjnvm58gym4ksqz1faibryhq35fcjg";
-      };
-    };
-    ocamlformat = 
-    {
-      pname = "ocamlformat";
-      version = "0.21.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml-ppx/ocamlformat/releases/download/0.21.0/ocamlformat-0.21.0.tbz";
-        sha256 = "0b9kaxq66mwdx6g78xdbw8k2gc4pp23rdaphx76g07sqpkv1f61a";
-      };
-      opamInputs = 
-      {
-        inherit (selection) uutf uuseg stdio re odoc-parser ocp-indent
-        ocaml-version ocaml menhirSdk menhirLib menhir fpath fix either
-        dune-build-info dune cmdliner base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocamlformat/ocamlformat.0.21.0";
-        hash = "sha256:14s6jxpam5z6mwscs5p9rrz3pp3xll9n5ybpfzgzldccfk8p4rp2";
-      };
-    };
-    ocamlformat-rpc = 
-    {
-      pname = "ocamlformat-rpc";
-      version = "0.21.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml-ppx/ocamlformat/releases/download/0.21.0/ocamlformat-0.21.0.tbz";
-        sha256 = "0b9kaxq66mwdx6g78xdbw8k2gc4pp23rdaphx76g07sqpkv1f61a";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocamlformat-rpc-lib ocamlformat ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocamlformat-rpc/ocamlformat-rpc.0.21.0";
-        hash = "sha256:1m50hpasclmlr3nmnmj9wrhjilpq6cb1y9a1jx549k77yylpj443";
-      };
-    };
-    ocamlformat-rpc-lib = 
-    {
-      pname = "ocamlformat-rpc-lib";
-      version = "0.21.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml-ppx/ocamlformat/releases/download/0.21.0/ocamlformat-0.21.0.tbz";
-        sha256 = "0b9kaxq66mwdx6g78xdbw8k2gc4pp23rdaphx76g07sqpkv1f61a";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune csexp;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocamlformat-rpc-lib/ocamlformat-rpc-lib.0.21.0";
-        hash = "sha256:0dgcj6fplf50i0kdhy8b8yh0ihf6mm63fbi3lri6bcjp95l7vpds";
-      };
-    };
-    ocp-indent = 
-    {
-      pname = "ocp-indent";
-      version = "1.8.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/OCamlPro/ocp-indent/archive/1.8.1.tar.gz";
-        sha256 = "0rqcvwzpwwzwqvrzg1l37jjiglrk2ijgjg1c7vy3xvc8lk9zyysw";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocamlfind ocaml dune cmdliner base-bytes;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocp-indent/ocp-indent.1.8.1";
-        hash = "sha256:08xqzlh3xp4xs613ypy9aaflyv8zfzjjgwl1bs7zbknlgp3xbng9";
-      };
-    };
-    ocplib-endian = 
-    {
-      pname = "ocplib-endian";
-      version = "1.2";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/OCamlPro/ocplib-endian/archive/refs/tags/1.2.tar.gz";
-        sha256 = "085kskr0cxcnv2d62n3jq1r273p7giisy56zfl26mm7amvl79blp";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml dune cppo base-bytes;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocplib-endian/ocplib-endian.1.2";
-        hash = "sha256:1jldvb471gyhkrzwfvqg722l3a8dc37hhhyas66skjzfmqyi2pnh";
-      };
-    };
-    ocurl = 
-    {
-      pname = "ocurl";
-      version = "0.9.2";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ygrek.org/p/release/ocurl/ocurl-0.9.2.tar.gz";
-        sha256 = "0qvpsqbq4qbd397n0nlv9cwlqfyjw7gfb5mmq1awvnklr0c9fdg0";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocamlfind ocaml conf-libcurl
-        base-unix;
-        lwt_ppx = selection.lwt_ppx or null;
-        lwt = selection.lwt or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ocurl/ocurl.0.9.2";
-        hash = "sha256:0k98l7zn29kdn053fvrw565l56vlms3qfwyirdzi03j68m59n0j3";
-      };
-    };
-    odoc-parser = 
-    {
-      pname = "odoc-parser";
-      version = "1.0.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml-doc/odoc-parser/releases/download/1.0.1/odoc-parser-1.0.1.tbz";
-        sha256 = "0b3xj3xs5s1pb3vl82zmlddv181b3zj9c7mhpa0fjq0v43jfifx2";
-      };
-      opamInputs = 
-      {
-        inherit (selection) result ocaml dune camlp-streams astring;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/odoc-parser/odoc-parser.1.0.1";
-        hash = "sha256:16mh4ar6ymclln8rm5xvnr2ljwqgp3hpw6n6zhzi5p7a1piag421";
-      };
-    };
-    ounit = 
-    {
-      pname = "ounit";
-      version = "2.2.6";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/gildor478/ounit/releases/download/v2.2.6/ounit-2.2.6.tbz";
-        sha256 = "04src5dc95bchimvnlbxih78pn95336b6rimbknqx8ch1qggp406";
-      };
-      opamInputs = {
-                     inherit (selection) ounit2 ocamlfind;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ounit/ounit.2.2.6";
-        hash = "sha256:1zklnbs3w8zph608llq4f9jdm31passgsn1afhljad7zvg4sqp4n";
-      };
-    };
-    ounit2 = 
-    {
-      pname = "ounit2";
-      version = "2.2.6";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/gildor478/ounit/releases/download/v2.2.6/ounit-2.2.6.tbz";
-        sha256 = "04src5dc95bchimvnlbxih78pn95336b6rimbknqx8ch1qggp406";
-      };
-      opamInputs = 
-      {
-        inherit (selection) stdlib-shims seq ocaml dune base-unix base-bytes;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ounit2/ounit2.2.2.6";
-        hash = "sha256:0d8ha4b9a528jqbi757lcsmnhjy0ncapxr6hki4p0ab7vr24bfij";
-      };
-    };
-    parsexp = 
-    {
-      pname = "parsexp";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/parsexp-v0.15.0.tar.gz";
-        sha256 = "14yi8dnmpkp52i44aa2knw7m6ib8s285j0k3i240qz5c28mr1vni";
-      };
-      opamInputs = 
-      {
-        inherit (selection) sexplib0 ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/parsexp/parsexp.v0.15.0";
-        hash = "sha256:0iplx26dvqbnp03ivh18gvak7l7khnklw2gfvr6yi3nmkdpgvvn2";
-      };
-    };
-    pbkdf = 
-    {
-      pname = "pbkdf";
-      version = "1.2.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/abeaumont/ocaml-pbkdf/archive/1.2.0.tar.gz";
-        sha256 = "0mvlh5iq4wqdfylxaq64sycxihp5jkjdgrrr9wmrlgk2yrsn3d3v";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml mirage-crypto dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/pbkdf/pbkdf.1.2.0";
-        hash = "sha256:0p1yzfcxk2rswqcbvcwgfl7x8ha55pk8dlx0pibjzjzakpxdhrx9";
-      };
-    };
-    ppx_assert = 
-    {
-      pname = "ppx_assert";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_assert-v0.15.0.tar.gz";
-        sha256 = "0rsr1yz2rs12w6qw0dz09dg3k2x2pfgd014fgp6nj993hhznapsf";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ppx_sexp_conv ppx_here ppx_compare
-        ppx_cold ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_assert/ppx_assert.v0.15.0";
-        hash = "sha256:1ll9q69y6bj8s10qmkrmka10kd8zvkb50r1snaf2hfsldsn9qg31";
-      };
-    };
-    ppx_base = 
-    {
-      pname = "ppx_base";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_base-v0.15.0.tar.gz";
-        sha256 = "181w7y2has8jsrqdsvd08q5nhnkx523vwsk3lg0cjix55qssvfyn";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ppx_sexp_conv ppx_hash ppx_enumerate
-        ppx_compare ppx_cold ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_base/ppx_base.v0.15.0";
-        hash = "sha256:0ilg603nkmn7mzvasyibhyalgw92w4lfgwpgwhwk7z50yrw3dqb7";
-      };
-    };
-    ppx_bench = 
-    {
-      pname = "ppx_bench";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_bench-v0.15.0.tar.gz";
-        sha256 = "0zp1qal278g9ccqhvgym7qk3gybd43d55qgcxkxp6wnd7qncg25i";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ppx_inline_test ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_bench/ppx_bench.v0.15.0";
-        hash = "sha256:15hd8qckij64lc133vdxnr5z87yy4zyg4d5fr0mvqkqadxdhchlk";
-      };
-    };
-    ppx_bin_prot = 
-    {
-      pname = "ppx_bin_prot";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_bin_prot-v0.15.0.tar.gz";
-        sha256 = "04s02l8124qdcyw1haha29rnqhg02aw16ilqj5gsx8yr24ifdj5j";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ppx_here ocaml dune bin_prot base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_bin_prot/ppx_bin_prot.v0.15.0";
-        hash = "sha256:1z2ymwrjl6xc0hh47rcbs6lp1xwl05m3wswy11szr2f8ss6ihmzq";
-      };
-    };
-    ppx_cold = 
-    {
-      pname = "ppx_cold";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_cold-v0.15.0.tar.gz";
-        sha256 = "13gqmfw2sq80anag9bwpm35600l1fnfn7mh9cbj1291k84rsx7wb";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_cold/ppx_cold.v0.15.0";
-        hash = "sha256:1m38jiza7vdnkngw9nfz0rhk31yn206kycmnr87g6zx3mdp2k898";
-      };
-    };
-    ppx_compare = 
-    {
-      pname = "ppx_compare";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_compare-v0.15.0.tar.gz";
-        sha256 = "11bkw7fgzfay8ws0piwphqip3y2lk2c9s2gil3zisnbvka92h1va";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_compare/ppx_compare.v0.15.0";
-        hash = "sha256:02y9vlqqqxq44lfwxq6as2wqqzilwqzky4dqykafbmn603mnv5y6";
-      };
-    };
-    ppx_cstruct = 
-    {
-      pname = "ppx_cstruct";
-      version = "6.1.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-cstruct/releases/download/v6.1.1/cstruct-6.1.1.tbz";
-        sha256 = "13aigx3bxa7ym66v22x17j574fjkvlb0fn94i40fczka1y3zjx0v";
-      };
-      opamInputs = 
-      {
-        inherit (selection) sexplib ppxlib ocaml dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_cstruct/ppx_cstruct.6.1.1";
-        hash = "sha256:1kcf870kapq6qbhrclz0kdygjidjpcfzq3l4x6gxclywqnks0zzi";
-      };
-    };
-    ppx_custom_printf = 
-    {
-      pname = "ppx_custom_printf";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_custom_printf-v0.15.0.tar.gz";
-        sha256 = "1056lgr0hfx0wry9q8c8v79llrf47yakqdchmk5giayv7ivsf35f";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ppx_sexp_conv ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_custom_printf/ppx_custom_printf.v0.15.0";
-        hash = "sha256:15h1ir1f7nqanblp9kplblprp3wzlmsiinxma45w7v3nl3icji1v";
-      };
-    };
-    ppx_derivers = 
-    {
-      pname = "ppx_derivers";
-      version = "1.2.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml-ppx/ppx_derivers/archive/1.2.1.tar.gz";
-        sha256 = "159vqy616ni18mn0dlv8c2y4h7mb4hahwjn53yrr59yyhzhmwndn";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_derivers/ppx_derivers.1.2.1";
-        hash = "sha256:1hj1ina0n7pgz16mrvijczapw75pd0hif0i18dpw7d1fyg2qr8py";
-      };
-    };
-    ppx_disable_unused_warnings = 
-    {
-      pname = "ppx_disable_unused_warnings";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_disable_unused_warnings-v0.15.0.tar.gz";
-        sha256 = "1gpfyr3a6zcifwcmpv83j371w5lxzy9889jhv8i9n7slny633axf";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_disable_unused_warnings/ppx_disable_unused_warnings.v0.15.0";
-        hash = "sha256:05d5g6jjxin38l1qk6jxrzx1wxlgv9j00bylpqzn1s8hi9ygqymz";
-      };
-    };
-    ppx_enumerate = 
-    {
-      pname = "ppx_enumerate";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_enumerate-v0.15.0.tar.gz";
-        sha256 = "16yhk3xk2hskmlspb6mikmdp60qaypyiqgq9p17kxpial6fgpdfy";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_enumerate/ppx_enumerate.v0.15.0";
-        hash = "sha256:1yp6h8n9177zp1gxai5s8rpqv9affjafp98svgawhnw66g96653j";
-      };
-    };
-    ppx_expect = 
-    {
-      pname = "ppx_expect";
-      version = "v0.15.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/ppx_expect/archive/refs/tags/v0.15.1.tar.gz";
-        sha256 = "15r0k8pvl7n53n2kzhdyyyh5am7z721gdcn6v8a18l11x63algnx";
-      };
-      opamInputs = 
-      {
-        inherit (selection) stdio re ppxlib ppx_inline_test ppx_here ocaml
-        dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_expect/ppx_expect.v0.15.1";
-        hash = "sha256:1qrmc7smlfk4zf5gmiwavk0g1qsw461yxbg61qxkp0mrkb3c8k31";
-      };
-    };
-    ppx_fields_conv = 
-    {
-      pname = "ppx_fields_conv";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_fields_conv-v0.15.0.tar.gz";
-        sha256 = "0q9fnv8jnwzgba90y8y0mx35nqnsj9yjm7xzw9ksyfq47fvb6anj";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml fieldslib dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_fields_conv/ppx_fields_conv.v0.15.0";
-        hash = "sha256:0c1zdm18md8cdblvhfwi901z9csj3cbw9065wh119z4z5z4vsw45";
-      };
-    };
-    ppx_fixed_literal = 
-    {
-      pname = "ppx_fixed_literal";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_fixed_literal-v0.15.0.tar.gz";
-        sha256 = "1z59hpljqsy8qbjkj05fly3b1p5lf7rifamrmn6c16gr6g73chgh";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_fixed_literal/ppx_fixed_literal.v0.15.0";
-        hash = "sha256:1hff8whad70y6qks1g416z23hajhcw6mbgh4w3sd3awcd6brxq0x";
-      };
-    };
-    ppx_hash = 
-    {
-      pname = "ppx_hash";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_hash-v0.15.0.tar.gz";
-        sha256 = "048pim0xicj8j9whd5lnchf62788sk3w89h12aybbalk1xm6dfs5";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ppx_sexp_conv ppx_compare ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_hash/ppx_hash.v0.15.0";
-        hash = "sha256:18mhr158ky23cbriz2w4b5dj3xj55z9i2r5ifix9m8sq7zqqa6x7";
-      };
-    };
-    ppx_here = 
-    {
-      pname = "ppx_here";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_here-v0.15.0.tar.gz";
-        sha256 = "1pyaw31j9n6r98ar947n3j2qj6rrszbdxr8jghk96j4ajdy05g65";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_here/ppx_here.v0.15.0";
-        hash = "sha256:12wgavjp9q0sbkymzzih9p4j80952dbh9djr0hpmx0by20dsr2in";
-      };
-    };
-    ppx_ignore_instrumentation = 
-    {
-      pname = "ppx_ignore_instrumentation";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_ignore_instrumentation-v0.15.0.tar.gz";
-        sha256 = "00lzm0agvh4vn5rwxb2byzixgmxjziimik99ncng6drrw0disi12";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_ignore_instrumentation/ppx_ignore_instrumentation.v0.15.0";
-        hash = "sha256:0jrh2xddyky6657ipn61bf3vm63j7cii0q5srjyg4h9ab64q8g0g";
-      };
-    };
-    ppx_inline_test = 
-    {
-      pname = "ppx_inline_test";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_inline_test-v0.15.0.tar.gz";
-        sha256 = "06w7l575wqw2zgvsfdlslwxd6ni1nbw9jhimd7zy5a64md0x2y1z";
-      };
-      opamInputs = 
-      {
-        inherit (selection) time_now ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_inline_test/ppx_inline_test.v0.15.0";
-        hash = "sha256:15vx091zg41k0himh9s5n6bh13l23sm4zrbpmp6j50ra5gd16bks";
-      };
-    };
-    ppx_jane = 
-    {
-      pname = "ppx_jane";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_jane-v0.15.0.tar.gz";
-        sha256 = "0il1is2q2h91fqwga2w16z3wr7xym79adry74d1d5pws4z949ynh";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ppx_variants_conv ppx_typerep_conv
-        ppx_string ppx_stable ppx_sexp_value ppx_sexp_message ppx_pipebang
-        ppx_optional ppx_optcomp ppx_module_timer ppx_log ppx_let
-        ppx_inline_test ppx_ignore_instrumentation ppx_here ppx_fixed_literal
-        ppx_fields_conv ppx_expect ppx_disable_unused_warnings
-        ppx_custom_printf ppx_bin_prot ppx_bench ppx_base ppx_assert ocaml
-        dune base_quickcheck;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_jane/ppx_jane.v0.15.0";
-        hash = "sha256:15fn6wz40njslshdsgi932h777szwsva5gvknxmn0djfazgzgdvi";
-      };
-    };
-    ppx_let = 
-    {
-      pname = "ppx_let";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_let-v0.15.0.tar.gz";
-        sha256 = "0m9niyiiv3qzv5x8hw0ifxjjzshnmx40dchka9d93mmnx88jqx34";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ppx_here ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_let/ppx_let.v0.15.0";
-        hash = "sha256:0zph3hbadx24yh6arg31pjmn98a0583qhqh451g06ilclfqz5n03";
-      };
-    };
-    ppx_log = 
-    {
-      pname = "ppx_log";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_log-v0.15.0.tar.gz";
-        sha256 = "0gknk2b4yss9r7rir4snqkmawby98v0q3salj77cg9fwqk4a6yh3";
-      };
-      opamInputs = 
-      {
-        inherit (selection) sexplib ppxlib ppx_sexp_message ppx_sexp_conv
-        ppx_here ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_log/ppx_log.v0.15.0";
-        hash = "sha256:1qz3fqggg9mxw3pi622h7v5g4kq1wq5ij1jxglqz2v0js6n5pfzn";
-      };
-    };
-    ppx_module_timer = 
-    {
-      pname = "ppx_module_timer";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_module_timer-v0.15.0.tar.gz";
-        sha256 = "0qkwjq5m017g10zkf50gsaphvfcs0l7jbzqnld4s7ixhghsd1a12";
-      };
-      opamInputs = 
-      {
-        inherit (selection) time_now stdio ppxlib ppx_base ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_module_timer/ppx_module_timer.v0.15.0";
-        hash = "sha256:02k47gyxn3ak25nmn99zx0bdpbq10v3zdrmq2ixz641a7v50rllz";
-      };
-    };
-    ppx_optcomp = 
-    {
-      pname = "ppx_optcomp";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_optcomp-v0.15.0.tar.gz";
-        sha256 = "1vd6ra0f1cm1kiqdh0iyzh24bp0ndl3s2va5z0mrw3y8ngbp0kn4";
-      };
-      opamInputs = 
-      {
-        inherit (selection) stdio ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_optcomp/ppx_optcomp.v0.15.0";
-        hash = "sha256:062wk4jw134j10nkmch4r5j18zizc4r2f0x1vdsbi9jzr9vzzl3n";
-      };
-    };
-    ppx_optional = 
-    {
-      pname = "ppx_optional";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_optional-v0.15.0.tar.gz";
-        sha256 = "0af7ayhfc1jc01mxs4k253gq49yss2ymkmjsy6fpcz39zhci7fvj";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_optional/ppx_optional.v0.15.0";
-        hash = "sha256:0gwcrjc5yhmkyi0qnqfyiw358d340p0ipliai6mi3adjys5y3mhn";
-      };
-    };
-    ppx_pipebang = 
-    {
-      pname = "ppx_pipebang";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_pipebang-v0.15.0.tar.gz";
-        sha256 = "1a10aqrwcbc3ykz0zsc4fpfhq4dhv812p4ncj8286qdbhr6mamhy";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_pipebang/ppx_pipebang.v0.15.0";
-        hash = "sha256:15jpwi4z99159gbdhba13iqs0r62rrl8apfdp7scc2lqrlc875m9";
-      };
-    };
-    ppx_sexp_conv = 
-    {
-      pname = "ppx_sexp_conv";
-      version = "v0.15.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/ppx_sexp_conv/archive/refs/tags/v0.15.1.tar.gz";
-        sha256 = "179f1iz504l008b3p3d9q2nj44wv7y31pc997x32m6aq1j2lfip3";
-      };
-      opamInputs = 
-      {
-        inherit (selection) sexplib0 ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_sexp_conv/ppx_sexp_conv.v0.15.1";
-        hash = "sha256:17303ra9w8cngiaz0s9q6d8617vyfx2nlz1kb813bs0g4vnj27mf";
-      };
-    };
-    ppx_sexp_message = 
-    {
-      pname = "ppx_sexp_message";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_sexp_message-v0.15.0.tar.gz";
-        sha256 = "1fnszzzvigf1z0y3hp758rmbm7lhl1ibfd1fkqk9fnz4h1gpi50d";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ppx_sexp_conv ppx_here ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_sexp_message/ppx_sexp_message.v0.15.0";
-        hash = "sha256:1vyx5krym61z5sqi8zbm1d5ra6xxfm7dnyl66r8i0f0x3radb08v";
-      };
-    };
-    ppx_sexp_value = 
-    {
-      pname = "ppx_sexp_value";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_sexp_value-v0.15.0.tar.gz";
-        sha256 = "13ambcwm8qd4nfl752rvr7ksqm9jxjns4h9s1hnv561gzgfd6vip";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ppx_sexp_conv ppx_here ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_sexp_value/ppx_sexp_value.v0.15.0";
-        hash = "sha256:0zjvyh1mz33nrq9sb9w166g3xm2l7m3p748n713nwdndm8dxiy6l";
-      };
-    };
-    ppx_stable = 
-    {
-      pname = "ppx_stable";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_stable-v0.15.0.tar.gz";
-        sha256 = "1crb0464fd10h4r690pf4ljx6hv59bmql51bvcw5js8cb5xfid4h";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_stable/ppx_stable.v0.15.0";
-        hash = "sha256:1mrgqjgyk3prd4gxyz183lp753c88qqkbaaivc4p1h945g1pcxzz";
-      };
-    };
-    ppx_string = 
-    {
-      pname = "ppx_string";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_string-v0.15.0.tar.gz";
-        sha256 = "14qkny138jfbh3gifyrd803alxxzzill5vwf7z325l1gg5b4jggk";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppxlib ppx_base ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_string/ppx_string.v0.15.0";
-        hash = "sha256:1vxrkcvc3bh4a4d6ackd2c0v7c0jl3wxr38hfdq8a0hqv9jiwgy5";
-      };
-    };
-    ppx_typerep_conv = 
-    {
-      pname = "ppx_typerep_conv";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_typerep_conv-v0.15.0.tar.gz";
-        sha256 = "17sy7fpn3v82aj1ga3q9yc8bbs37y45k8mhhaj7zvjm32gnjj5z7";
-      };
-      opamInputs = 
-      {
-        inherit (selection) typerep ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_typerep_conv/ppx_typerep_conv.v0.15.0";
-        hash = "sha256:1qkjpivg49x4vsh5mxwk6bjfrw57ad15gpxp26sbfxl61wiblnca";
-      };
-    };
-    ppx_variants_conv = 
-    {
-      pname = "ppx_variants_conv";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/ppx_variants_conv-v0.15.0.tar.gz";
-        sha256 = "175cvwwz624x81yhzd4547vk8hjplhkbbll5ds8zmhmnwzv9cw3f";
-      };
-      opamInputs = 
-      {
-        inherit (selection) variantslib ppxlib ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppx_variants_conv/ppx_variants_conv.v0.15.0";
-        hash = "sha256:1drj2gavn3ax0hm1pq9mk78ycizd3i2vj7wb4yycr814mlyj6dhg";
-      };
-    };
-    ppxlib = 
-    {
-      pname = "ppxlib";
-      version = "0.28.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml-ppx/ppxlib/releases/download/0.28.0/ppxlib-0.28.0.tbz";
-        sha256 = "0xzk1jv4hm37p7l02j157plbibk61ashjj4nr8466841l3wyaynq";
-      };
-      opamInputs = 
-      {
-        inherit (selection) stdlib-shims sexplib0 ppx_derivers
-        ocaml-compiler-libs ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ppxlib/ppxlib.0.28.0";
-        hash = "sha256:1iskcinyr07lmzavzwmarbdg05slynliahqbilak619fj23kcfa4";
-      };
-    };
-    protocol_version_header = 
-    {
-      pname = "protocol_version_header";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/protocol_version_header-v0.15.0.tar.gz";
-        sha256 = "1izks6hxqd4gjxmwiv5ng52js8jbccl5hmyrvdqznjycp9ky9i6h";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_jane ocaml dune core;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/protocol_version_header/protocol_version_header.v0.15.0";
-        hash = "sha256:1xyyaq37pgi9j6jn7rbj07px6ynmqmpj6gfyrsqqrf6gbb7gajqy";
-      };
-    };
-    psq = 
-    {
-      pname = "psq";
-      version = "0.2.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/pqwy/psq/releases/download/v0.2.1/psq-0.2.1.tbz";
-        sha256 = "0i6k5i3dha3b4syz4jpd5fi6dkalas8bhcpfk4blprxb7r9my022";
-      };
-      opamInputs = {
-                     inherit (selection) seq ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/psq/psq.0.2.1";
-        hash = "sha256:1igal3ask3mv8nb436q71zb70zpbb7gpr6x3q73ymyi5k46iqcxs";
-      };
-    };
-    ptime = 
-    {
-      pname = "ptime";
-      version = "1.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/ptime/releases/ptime-1.0.0.tbz";
-        sha256 = "02qiwafysw5vpbxmkhgf6hfr5fv967rxzfkfy18kgj3206686724";
-      };
-      opamInputs = 
-      {
-        inherit (selection) topkg ocamlfind ocamlbuild ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/ptime/ptime.1.0.0";
-        hash = "sha256:0ad40dpgfszf9bibdqygd4f16gbf3b1irx6x7p92cbd6kffmjmrs";
-      };
-    };
-    randomconv = 
-    {
-      pname = "randomconv";
-      version = "0.1.3";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/hannesm/randomconv/releases/download/v0.1.3/randomconv-v0.1.3.tbz";
-        sha256 = "1iv3r0s5kqxs893b0d55f0r62k777haiahfkkvvfbqwgqsm6la4v";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocaml dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/randomconv/randomconv.0.1.3";
-        hash = "sha256:13vagvgvzzwihlxsm65clpsp4c1s15bd24zkbb7f7h20hl681g81";
-      };
-    };
-    re = 
-    {
-      pname = "re";
-      version = "1.10.4";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml/ocaml-re/releases/download/1.10.4/re-1.10.4.tbz";
-        sha256 = "0z3lracww84cswj0a4s28x987sk28c7h2j87hb3iv6xa011kxsw3";
-      };
-      opamInputs = {
-                     inherit (selection) seq ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/re/re.1.10.4";
-        hash = "sha256:00918wlxkkbj8dwpiwpyyvc8falk4ddrf0pxn5v2kahc2jl251vg";
-      };
-    };
-    result = 
-    {
-      pname = "result";
-      version = "1.5";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/result/releases/download/1.5/result-1.5.tbz";
-        sha256 = "0cpfp35fdwnv3p30a06wd0py3805qxmq3jmcynjc3x2qhlimwfkw";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/result/result.1.5";
-        hash = "sha256:0ybmvlisfz5swvbcq855czz1ysv9zxmb79f1m0x8284hczmfm98f";
-      };
-    };
-    rresult = 
-    {
-      pname = "rresult";
-      version = "0.7.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/rresult/releases/rresult-0.7.0.tbz";
-        sha256 = "0h2mjyzhay1p4k7n0mzaa7hlc7875kiy6m1i3r1n03j6hddpzahi";
-      };
-      opamInputs = 
-      {
-        inherit (selection) topkg ocamlfind ocamlbuild ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/rresult/rresult.0.7.0";
-        hash = "sha256:0131az6qj1086hi1kjc7x99x1q4c0z3axjwd1wbmr6c6r6nnaj6y";
-      };
-    };
-    seq = 
-    {
-      pname = "seq";
-      version = "base";
-      src = null;
-      opamInputs = {
-                     inherit (selection) ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/seq/seq.base";
-        hash = "sha256:1vm8mk6zm2q3fwnkprl6jib048zr4ysldw0bl74x6wwbxj0vx6k9";
-      };
-    };
-    sexp_pretty = 
-    {
-      pname = "sexp_pretty";
-      version = "v0.15.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/sexp_pretty/archive/refs/tags/v0.15.1.tar.gz";
-        sha256 = "1s77hxxsn3scy5gcyxrbq02f4ckhxhm1r6if5fsglj490qk0q5by";
-      };
-      opamInputs = 
-      {
-        inherit (selection) sexplib re ppx_base ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/sexp_pretty/sexp_pretty.v0.15.1";
-        hash = "sha256:1pii22sgx2qqqlvrrm2v45szs15ym240qs01pchjy5bfwvwaalzf";
-      };
-    };
-    sexplib = 
-    {
-      pname = "sexplib";
-      version = "v0.15.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/sexplib/archive/refs/tags/v0.15.1.tar.gz";
-        sha256 = "1g5wxlwrs50r3kgfyqqm608iw0yfrj4ra7s43z05imwj1llpvnkm";
-      };
-      opamInputs = 
-      {
-        inherit (selection) sexplib0 parsexp ocaml num dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/sexplib/sexplib.v0.15.1";
-        hash = "sha256:0n3j8px5f2vab0d47p6zm4daymfq7w7n4kfgplprf56gd9w3irvb";
-      };
-    };
-    sexplib0 = 
-    {
-      pname = "sexplib0";
-      version = "v0.15.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/sexplib0/archive/refs/tags/v0.15.1.tar.gz";
-        sha256 = "1cv78931di97av82khqwmx5s51mrn9d2b82z0si88gxwndz83kg8";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/sexplib0/sexplib0.v0.15.1";
-        hash = "sha256:1yg5rknfbx67wrs3gampx3jmcw9si38n90cj4kg5626k41nmhsc0";
-      };
-    };
-    spawn = 
-    {
-      pname = "spawn";
-      version = "v0.15.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/janestreet/spawn/archive/v0.15.1.tar.gz";
-        sha256 = "0l4xq43dxsvxli9kkpnywrw81dyn11bfpdlsd36kyv5b9wqyxzcs";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/spawn/spawn.v0.15.1";
-        hash = "sha256:18cl7lgcf5gl3r5ffdqiza5hydjgn8hwk4lsb6gsibv8jd7jx8bq";
-      };
-    };
-    splittable_random = 
-    {
-      pname = "splittable_random";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/splittable_random-v0.15.0.tar.gz";
-        sha256 = "006vxsmjlayqm39r343mishikx63ifd4kkwbr92rzhxmbz4fdy4z";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_sexp_message ppx_inline_test ppx_bench
-        ppx_assert ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/splittable_random/splittable_random.v0.15.0";
-        hash = "sha256:02qr51n5sq4hc131grw37p92j30pflia89qgsvg0yw4czc5lvlqc";
-      };
-    };
-    stdio = 
-    {
-      pname = "stdio";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/stdio-v0.15.0.tar.gz";
-        sha256 = "0jsyg4jlp76d9gx1fngms6nfs7dcpsysdsvkywjq9a663n994wn3";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/stdio/stdio.v0.15.0";
-        hash = "sha256:19z0wh8sm8ldwwpqq2hxn85b74z1g3jlkx7vfpqknm0pxhill7m1";
-      };
-    };
-    stdlib-shims = 
-    {
-      pname = "stdlib-shims";
-      version = "0.3.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml/stdlib-shims/releases/download/0.3.0/stdlib-shims-0.3.0.tbz";
-        sha256 = "0jnqsv6pqp5b5g7lcjwgd75zqqvcwcl5a32zi03zg1kvj79p5gxs";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/stdlib-shims/stdlib-shims.0.3.0";
-        hash = "sha256:1hwyzzcx7clz4p58fj3n6frq2srbxdmhmxxd6n6mpw9gj2vs6yiw";
-      };
-    };
-    stringext = 
-    {
-      pname = "stringext";
-      version = "1.6.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/rgrinberg/stringext/releases/download/1.6.0/stringext-1.6.0.tbz";
-        sha256 = "1sh6nafi3i9773j5mlwwz3kxfzdjzsfqj2qibxhigawy5vazahfv";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/stringext/stringext.1.6.0";
-        hash = "sha256:01k5gspcs4i7ipghzm2qsxgmyja86nd224achciny46xdjpkchpd";
-      };
-    };
-    tcpip = 
-    {
-      pname = "tcpip";
-      version = "7.1.2";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/mirage-tcpip/releases/download/v7.1.2/tcpip-7.1.2.tbz";
-        sha256 = "0va63icbcrg7dm0q108bd3rsswllcdnwpgnifmr3y52zlfpsxdln";
-      };
-      opamInputs = 
-      {
-        inherit (selection) randomconv ppx_cstruct ocaml mirage-time
-        mirage-random mirage-profile mirage-net mirage-flow mirage-clock
-        metrics macaddr-cstruct macaddr lwt-dllist lwt lru logs ipaddr fmt
-        ethernet duration dune cstruct-lwt cstruct conf-pkg-config
-        arp;
-        ocaml-freestanding = selection.ocaml-freestanding or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/tcpip/tcpip.7.1.2";
-        hash = "sha256:0wys06kd31qk0qigaqa211qlf6pr83qjb14p92x47213p61msrpp";
-      };
-    };
-    textutils = 
-    {
-      pname = "textutils";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/textutils-v0.15.0.tar.gz";
-        sha256 = "1pr2vhvmiqcdipwd21vif24p2zzv6kbhvcmzkzb7qwhqmnv8ydn0";
-      };
-      opamInputs = 
-      {
-        inherit (selection) uutf textutils_kernel ppx_jane ocaml dune
-        core_unix core_kernel core;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/textutils/textutils.v0.15.0";
-        hash = "sha256:111nnn4f1dfjblq3sc1kd2giv99jqk7hw7gmhz093lcwzz6m1qwg";
-      };
-    };
-    textutils_kernel = 
-    {
-      pname = "textutils_kernel";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/textutils_kernel-v0.15.0.tar.gz";
-        sha256 = "0dzsazmwnjq11z533wq3a319drlgrjgxr28y2j40h2i4qdfr3b5c";
-      };
-      opamInputs = 
-      {
-        inherit (selection) uutf ppx_jane ocaml dune core;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/textutils_kernel/textutils_kernel.v0.15.0";
-        hash = "sha256:186g5f4wcqjb05wfhdjrhbnbdsw4rpq0kv4anjxgsy9qmn0qa75i";
-      };
-    };
-    time_now = 
-    {
-      pname = "time_now";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/time_now-v0.15.0.tar.gz";
-        sha256 = "1a6b1f55mwci1bd8w8vji0qn6wbs60jbwixvwgy4klx2blq57cqk";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_optcomp ppx_base ocaml jst-config
-        jane-street-headers dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/time_now/time_now.v0.15.0";
-        hash = "sha256:1l6ffa9f0i1kpm2fgmhl2f63bbswd8sgzjbfgpcxkgxsivjgp6qf";
-      };
-    };
-    timezone = 
-    {
-      pname = "timezone";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/timezone-v0.15.0.tar.gz";
-        sha256 = "03a1f492qx8qpxcnr3vylm4r04f7pyhy445rq2kafyf70vfwxzm5";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_jane ocaml dune core;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/timezone/timezone.v0.15.0";
-        hash = "sha256:1r2pk2zlxlmznr7qi0sip0nvhfm0i619jcqdjl41dfvh7jbagjnx";
-      };
-    };
-    tls = 
-    {
-      pname = "tls";
-      version = "0.15.4";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirleft/ocaml-tls/releases/download/v0.15.4/tls-0.15.4.tbz";
-        sha256 = "10n3s7qa6yzchhn16zzb2cyqsj6b8l6dx8yhs7pnjq3gn1b1v3az";
-      };
-      opamInputs = 
-      {
-        inherit (selection) x509 sexplib ptime ppx_sexp_conv ppx_cstruct
-        ocaml mirage-crypto-rng mirage-crypto-pk mirage-crypto-ec
-        mirage-crypto lwt logs ipaddr-sexp ipaddr hkdf fmt dune domain-name
-        cstruct-sexp cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/tls/tls.0.15.4";
-        hash = "sha256:11wgh6mngsfvl12jv10gabfbjzr5hk1sfwsm5jrpxwfnz63qy101";
-      };
-    };
-    tls-mirage = 
-    {
-      pname = "tls-mirage";
-      version = "0.15.4";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirleft/ocaml-tls/releases/download/v0.15.4/tls-0.15.4.tbz";
-        sha256 = "10n3s7qa6yzchhn16zzb2cyqsj6b8l6dx8yhs7pnjq3gn1b1v3az";
-      };
-      opamInputs = 
-      {
-        inherit (selection) x509 tls ptime ocaml mirage-kv mirage-flow
-        mirage-crypto-pk mirage-crypto mirage-clock lwt fmt dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/tls-mirage/tls-mirage.0.15.4";
-        hash = "sha256:1k834b7l57l62c4k3syx0y94g0i2an2m4kwm0s1nffwny8cvk020";
-      };
-    };
-    topkg = 
-    {
-      pname = "topkg";
-      version = "1.0.5";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/topkg/releases/topkg-1.0.5.tbz";
-        sha256 = "1iyinmcfqpprk7k4cc51nqgypayprbj4larwcfqw86k5dri84825";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocamlfind ocamlbuild ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/topkg/topkg.1.0.5";
-        hash = "sha256:04vg4zic7f6zk44vkvqw2fcr562hl7d0gklv3vgphk4n3bnqbcyy";
-      };
-    };
-    typerep = 
-    {
-      pname = "typerep";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/typerep-v0.15.0.tar.gz";
-        sha256 = "0ghqlfkpb20l3wp7dgb27viz5zdsmsd3ijrzb4bs8h0lniyx7j16";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/typerep/typerep.v0.15.0";
-        hash = "sha256:0awhhkrrkzkgvc04k1ymrna2wcw72wgv2qlkcibrymgq1kvzrkyr";
-      };
-    };
-    uchar = 
-    {
-      pname = "uchar";
-      version = "0.0.2";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml/uchar/releases/download/v0.0.2/uchar-0.0.2.tbz";
-        sha256 = "1w2saw7zanf9m9ffvz2lvcxvlm118pws2x1wym526xmydhqpyfa7";
-      };
-      opamInputs = {
-                     inherit (selection) ocamlbuild ocaml;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/uchar/uchar.0.0.2";
-        hash = "sha256:028vff7rkmhyyn3xr5flfkc3ihz0axirbg538an8wbsmc4y1gv02";
-      };
-    };
-    uri = 
-    {
-      pname = "uri";
-      version = "4.2.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-uri/releases/download/v4.2.0/uri-v4.2.0.tbz";
-        sha256 = "0szifda6yism5vn5jdizkha3ad0xk6zw4xgfl8g77dnv83ci7h65";
-      };
-      opamInputs = 
-      {
-        inherit (selection) stringext ocaml dune angstrom;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/uri/uri.4.2.0";
-        hash = "sha256:1s0rbjixhl1ypxv9xxmldlmxm6gj9rrzmcgydp8dna4n0wza4hbf";
-      };
-    };
-    uri-sexp = 
-    {
-      pname = "uri-sexp";
-      version = "4.2.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-uri/releases/download/v4.2.0/uri-v4.2.0.tbz";
-        sha256 = "0szifda6yism5vn5jdizkha3ad0xk6zw4xgfl8g77dnv83ci7h65";
-      };
-      opamInputs = 
-      {
-        inherit (selection) uri sexplib0 ppx_sexp_conv dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/uri-sexp/uri-sexp.4.2.0";
-        hash = "sha256:0n2g1p9hn7n38pdxyyjahbaa5z37nw1jw1mxgpad7jy86slfilac";
-      };
-    };
-    uucp = 
-    {
-      pname = "uucp";
-      version = "15.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/uucp/releases/uucp-15.0.0.tbz";
-        sha256 = "0c2k9gkg442l7hnc8rn1vqzn6qh68w9fx7h3nj03n2x90ps98ixc";
-      };
-      opamInputs = 
-      {
-        inherit (selection) topkg ocamlfind ocamlbuild
-        ocaml;
-        uutf = selection.uutf or null;
-        uunf = selection.uunf or null;
-        cmdliner = selection.cmdliner or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/uucp/uucp.15.0.0";
-        hash = "sha256:0bgf8rrsvnzq9wzlf0grgbz00mhjy5ls6g2az0m41mflxcnaz51j";
-      };
-    };
-    uuseg = 
-    {
-      pname = "uuseg";
-      version = "15.0.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/uuseg/releases/uuseg-15.0.0.tbz";
-        sha256 = "1qz130wlmnvb6j7kpvgjlqmdm2jqid4wb1dmrsls4hdm4rp7gk5b";
-      };
-      opamInputs = 
-      {
-        inherit (selection) uucp topkg ocamlfind ocamlbuild
-        ocaml;
-        uutf = selection.uutf or null;
-        cmdliner = selection.cmdliner or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/uuseg/uuseg.15.0.0";
-        hash = "sha256:08ndzcf2y5cj03iw57gqgbszq37xi6pjfaj86f3qdc62q2h1afx5";
-      };
-    };
-    uutf = 
-    {
-      pname = "uutf";
-      version = "1.0.3";
-      src = pkgs.fetchurl 
-      {
-        url = "https://erratique.ch/software/uutf/releases/uutf-1.0.3.tbz";
-        sha256 = "0s05r8ggp1g97zq4rnvbxzj22pv8ld0k5wsdw662jw0y7mhsawl7";
-      };
-      opamInputs = 
-      {
-        inherit (selection) topkg ocamlfind ocamlbuild
-        ocaml;
-        cmdliner = selection.cmdliner or null;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/uutf/uutf.1.0.3";
-        hash = "sha256:1x57h3bc68rsm2kd18wjbkfjk67shak6jgplp7paw97faqgmgx3x";
-      };
-    };
-    variantslib = 
-    {
-      pname = "variantslib";
-      version = "v0.15.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://ocaml.janestreet.com/ocaml-core/v0.15/files/variantslib-v0.15.0.tar.gz";
-        sha256 = "12dssx4by6rgjzfrvksz83hkcpmsq0brn87dh22pv1rrwhw79n75";
-      };
-      opamInputs = {
-                     inherit (selection) ocaml dune base;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/variantslib/variantslib.v0.15.0";
-        hash = "sha256:1x4qsay1hpsrh147rmqbhzmg0lv3inci31mjsa5k28hhb4mk3sfh";
-      };
-    };
-    vchan = 
-    {
-      pname = "vchan";
-      version = "6.0.1";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-vchan/releases/download/v6.0.1/vchan-6.0.1.tbz";
-        sha256 = "0pdrh4bs68nh4k3gasis2352a2j4lsbg2aa9qllbd2hm6chxskp4";
-      };
-      opamInputs = 
-      {
-        inherit (selection) xenstore_transport xenstore sexplib ppx_sexp_conv
-        ppx_cstruct ocaml mirage-flow lwt io-page dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/vchan/vchan.6.0.1";
-        hash = "sha256:0wbf73m335srlm16b24nd8cnzl5ypy72xvxg9q8d7v35dbdm9vms";
-      };
-    };
-    x509 = 
-    {
-      pname = "x509";
-      version = "0.16.2";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirleft/ocaml-x509/releases/download/v0.16.2/x509-0.16.2.tbz";
-        sha256 = "0qkzspjvsdng52lmjrxzlzz4vg411airmjw5sfgfb4806mkdkzv5";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ptime pbkdf ocaml mirage-crypto-rng
-        mirage-crypto-pk mirage-crypto-ec mirage-crypto logs ipaddr gmap fmt
-        dune domain-name cstruct base64 asn1-combinators;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/x509/x509.0.16.2";
-        hash = "sha256:0glicx43qps4fjmdyvjybnaza6n82ddyrxmskc87da3jzg11sr4s";
-      };
-    };
-    xenstore = 
-    {
-      pname = "xenstore";
-      version = "2.2.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/mirage/ocaml-xenstore/releases/download/v2.2.0/xenstore-2.2.0.tbz";
-        sha256 = "0b8qqg7a2bcwfbva042l5kiivpwc1pa8bvwic1fy87bkvsvfmjfl";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ppx_cstruct ocaml lwt dune cstruct;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/xenstore/xenstore.2.2.0";
-        hash = "sha256:13hhn175mvsl6kp7412gdch4bnn6v5fspvhxmwwlyfapyxpa03q8";
-      };
-    };
-    xenstore_transport = 
-    {
-      pname = "xenstore_transport";
-      version = "1.3.0";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/xapi-project/ocaml-xenstore-clients/archive/v1.3.0.tar.gz";
-        sha256 = "1fa190f9y45w0g6l429wx2y7p1a1a34r9jr8fzjqac2z2wppmcd1";
-      };
-      opamInputs = 
-      {
-        inherit (selection) xenstore ocaml lwt dune;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/xenstore_transport/xenstore_transport.1.3.0";
-        hash = "sha256:1am1yinxcl6p7qx9kkh9rc8kk4hxhv1awlfk5i0mpmid4n7rqawl";
-      };
-    };
-    yojson = 
-    {
-      pname = "yojson";
-      version = "2.0.2";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml-community/yojson/releases/download/2.0.2/yojson-2.0.2.tbz";
-        sha256 = "06s6wpdnz30lbd90d9jn8nhn0z45whsxm8rqjji88fppibrvcsw7";
-      };
-      opamInputs = 
-      {
-        inherit (selection) seq ocaml dune cppo;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/yojson/yojson.2.0.2";
-        hash = "sha256:1c1xa9wkmdsayy8a2i981k838xazb2afkhyxkpg0kffdgb4wqwfn";
-      };
-    };
-    zarith = 
-    {
-      pname = "zarith";
-      version = "1.12";
-      src = pkgs.fetchurl 
-      {
-        url = "https://github.com/ocaml/Zarith/archive/release-1.12.tar.gz";
-        sha256 = "1098xpqsq3gwpz9k2gc6ahiz2zk0z0xxi1lwc07nvj2570y5ccnc";
-      };
-      opamInputs = 
-      {
-        inherit (selection) ocamlfind ocaml conf-gmp;
-      };
-      opamSrc = repoPath (repos.opam-repository.src) 
-      {
-        package = "packages/zarith/zarith.1.12";
-        hash = "sha256:03by05004bgfkfllpacf3vk1h8i6q7wzwi7cgxy0nyj5ffga0ggh";
-      };
-    };
-  };
-}
-
diff --git a/nix/opam2nix.nix b/nix/opam2nix.nix
deleted file mode 100644
index af974fcb3a..0000000000
--- a/nix/opam2nix.nix
+++ /dev/null
@@ -1 +0,0 @@
-import (builtins.fetchTarball "https://github.com/timbertson/opam2nix/archive/v1.tar.gz") {}
diff --git a/shell.nix b/shell.nix
deleted file mode 100644
index d07fe63b23..0000000000
--- a/shell.nix
+++ /dev/null
@@ -1,57 +0,0 @@
-let
-  pkgs = (import <nixpkgs> { });
-  local = (import ./default.nix { });
-  inherit (pkgs) stdenv lib;
-  ocamlformat =
-    let
-      ocamlformat_version =
-        let
-          lists = pkgs.lib.lists;
-          strings = pkgs.lib.strings;
-          ocamlformat_config = strings.splitString "\n" (builtins.readFile ./.ocamlformat);
-          prefix = "version = ";
-          ocamlformat_version_pred = line: strings.hasPrefix prefix line;
-          version_line = lists.findFirst ocamlformat_version_pred "not_found" ocamlformat_config;
-          version = strings.removePrefix prefix version_line;
-        in
-        builtins.replaceStrings ["."] ["_"] version;
-    in builtins.getAttr ("ocamlformat_" + ocamlformat_version) pkgs;
-in with local;
-
-pkgs.mkShell {
-  inputsFrom = [
-    http
-    cohttp
-    cohttp-top
-    cohttp-lwt
-    cohttp-lwt-unix
-    cohttp-lwt-jsoo
-    cohttp-async
-    cohttp-bench
-    cohttp-mirage
-    cohttp-curl
-    cohttp-curl-lwt
-    cohttp-curl-async
-  ];
-  buildInputs = (with pkgs; [
-    yarn
-    nodejs-14_x
-    ocamlPackages.ocaml-lsp
-  ]) ++ [] ++ (with opam; [
-    # test
-    conf-libev
-    ppx_expect
-    ocamlformat-rpc
-    fmt
-    alcotest
-    ounit
-    lwt_ppx
-    base_quickcheck
-    ppx_assert
-    ppx_sexp_conv
-    ppx_compare
-    ppx_here
-    core_bench
-    crowbar
-  ]);
-}