Cannot crate local switch: Missing dependency http >= dev

[serpent7776]

I did a fresh pull and tried to build cohttp from the sources, but when I'm creating a local switch it fails:

$ opam switch create ./ 5.0.0
http is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)
cohttp is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)
cohttp-top is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)
cohttp-server-lwt-unix is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)
cohttp-mirage is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)
cohttp-lwt is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)
cohttp-lwt-unix is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)
cohttp-lwt-jsoo is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)
cohttp-eio is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)
cohttp-curl is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)
cohttp-curl-lwt is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)
cohttp-curl-async is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)
Package cohttp-bench does not exist, create as a NEW package? [y/n] y
cohttp-bench is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version dev)
cohttp-async is now pinned to git+file:///mnt/data/data/git/ocaml-cohttp#master (version 6.0.0~beta2)

<><> Installing new switch packages <><><><><><><><><><><><><><><><><><><><><><>
Switch invariant: ["ocaml-base-compiler" {= "5.0.0"} | "ocaml-system" {= "5.0.0"}]
[ERROR] Could not determine which packages to install for this switch:
  * Missing dependency:
    - http >= dev
    no matching version

When I tried with named switch opam switch create cohttp 5.0.0 it went fine, but there's the same error when trying to opam install ./

[ERROR] Package conflict!
  * Missing dependency:
    - http >= dev
    no matching version

No solution found, exiting

My system is Manjaro linux, opam installed from system packages, version 2.2.1-1, system ocaml is version 5.2.0.