with (import <nixpkgs> {});
let
  env = bundlerEnv {
    name = "queue_exporter-bundler-env";
    inherit ruby;
    gemfile  = ./Gemfile;
    lockfile = ./Gemfile.lock;
    gemset   = ./gemset.nix;
  };
in stdenv.mkDerivation {
  name = "queue-exporter";
  buildInputs = [ pkgs.ruby env env.gems.rack ];
  #buildPhase = ''
  #  echo "Build queue_exporter
  #  mkdir -p "$out/lib"
  #  for f in ${pkgs.systemd}/lib/libsystemd*
  #  do
  #    ln -s "$f" "$out/lib/"
  #  done
  #'';
}