# Pastebin B1dYOK99
with import <nixpkgs> {};
let
  ruby = ruby_2_4;
  bundler = bundler.override { inherit ruby; };
  gems = bundlerEnv {
      name = "foobar-gems";
      gemdir = ./.;
      inherit ruby;
  }
in
  stdenv.mkDerivation {
      name = "foobar-shell";
      buildInputs = [
        bundler bundix ruby (lowPrio gems)
      ];
  }