anyone should be able to build binaries

Dockerfile.libuv

@@ -0,0 +1,21 @@
+# To build libuv and extract the files from the Docker container:
+# export CF_STACK=cflinuxfs2
+# export LIBUV_VERSION=1.4.2
+# cat Dockerfile.libuv | envsubst | docker build -t libuv-${CF_STACK}-${LIBUV_VERSION} -
+# docker run -v /somehostdir:/built --rm libuv-${CF_STACK}-${LIBUV_VERSION} /bin/bash -c "cd /usr/local && tar czf /built/libuv-${CF_STACK}-${LIBUV_VERSION}.tar.gz ./include/uv* ./lib/libuv*"
+
+FROM cloudfoundry/$CF_STACK
+
+RUN apt-get -qq update && apt-get -qqy install curl \
+        autoconf \
+        automake \
+        build-essential \
+        libtool
+
+RUN curl -sSL https://github.com/libuv/libuv/archive/v${LIBUV_VERSION}.tar.gz | tar zxfv - -C /usr/local/src \
+        && cd /usr/local/src/libuv-$LIBUV_VERSION \
+        && sh autogen.sh \
+        && ./configure \
+        && make \
+        && make install \
+        && rm -rf /usr/local/src/libuv-$LIBUV_VERSION

Dockerfile.mono

@@ -0,0 +1,20 @@
+# To build libuv and extract the files from the Docker container:
+# export CF_STACK=cflinuxfs2
+# export MONO_RELEASE=4.0.1.44
+# cat Dockerfile.mono | envsubst | docker build -t libuv-${CF_STACK}-${LIBUV_VERSION} -
+# docker run -v /somehostdir:/built --rm mono-${CF_STACK}-${MONO_RELEASE} tar czf /built/mono-${CF_STACK}-${MONO_RELEASE}.tar.gz -C /app ./mono
+
+FROM cloudfoundry/$CF_STACK
+
+RUN apt-get -qq update && apt-get -y install curl
+RUN apt-get -qq update && apt-get -y --force-yes install unzip git-core automake libtool autoconf \
+        autotools-dev gettext mono-devel
+
+RUN git clone https://github.com/mono/mono
+
+WORKDIR /mono
+RUN git checkout tags/mono-$MONO_RELEASE
+RUN mkdir -p /app/mono; ./autogen.sh -prefix=/app/mono
+RUN make get-monolite-latest
+RUN make
+RUN make install

README.md

@@ -34,15 +34,19 @@ Disconnected environments are not fully supported. The .NET Version Manager, .NE
   BUNDLE_GEMFILE=cf.Gemfile bundle
   ```
 
-3. Build the buildpack
+3. Build the binary dependencies (optional)
+
+ If you need to rebuild these, to change a version for example, see the included Dockerfiles. They contain comments specifying the commands to run. Then update manifest.yml to point to your files.
+
+4. Build the buildpack
 
     `uncached` means a TAR files containing Mono and libuv will be downloaded the first time an application is staged, and `cached` means they will be packaged in the buildpack ZIP.
 
   ```shell
   BUNDLE_GEMFILE=cf.Gemfile bundle exec buildpack-packager [ uncached | cached ]
   ```
 
-4. Use in Cloud Foundry
+5. Use in Cloud Foundry
 
     Upload the buildpack to your Cloud Foundry and optionally specify it by name