{ stdenv, fetchFromGitHub, curl, dmd, libevent, rsync }:

let

  dubBuild = stdenv.mkDerivation rec {
    name = "dubBuild-${version}";
    version = "1.6.0";

    enableParallelBuilding = true;

    src = fetchFromGitHub {
      owner = "dlang";
      repo = "dub";
      rev = "v${version}";
      sha256 = "1xjr5pp263lbcd4harxy1ybh7q0kzj9iyy63ji6pn66fizrgm7zk";
    };

    postPatch = ''
      # Avoid that the version file is overwritten
      substituteInPlace build.sh \
        --replace source/dub/version_.d /dev/null

      patchShebangs .
    '';

    nativeBuildInputs = [ dmd libevent rsync ];
    buildInputs = [ curl ];

    buildPhase = ''
      export DMD=${dmd.out}/bin/dmd
      ./build.sh
    '';

    installPhase = ''
      mkdir $out
      mkdir $out/bin
      cp bin/dub $out/bin
    '';

    meta = with stdenv.lib; {
      description = "Package and build manager for D applications and libraries";
      homepage = http://code.dlang.org/;
      license = licenses.mit;
      maintainers = with maintainers; [ ThomasMader ];
      platforms = [ "x86_64-linux" "i686-linux" "x86_64-darwin" ];
    };
  };

  # Need to test in a fixed-output derivation, otherwise the
  # network tests would fail if sandbox mode is enabled.
  dubUnittests = stdenv.mkDerivation rec {
    name = "dubUnittests-${version}";
    version = dubBuild.version;

    enableParallelBuilding = dubBuild.enableParallelBuilding;
    preferLocalBuild = true;
    inputString = dubBuild.outPath;
    outputHashAlgo = "sha256";
    outputHash = builtins.hashString "sha256" inputString;

    src = dubBuild.src;

    postPatch = dubBuild.postPatch;

    nativeBuildInputs = dubBuild.nativeBuildInputs;
    buildInputs = dubBuild.buildInputs;

    buildPhase = ''
      # Can't use dub from dubBuild directly because one unittest 
      # (issue895-local-configuration) needs to generate a config 
      # file under ../etc relative to the dub location.
      cp ${dubBuild}/bin/dub bin/
      export DUB=$NIX_BUILD_TOP/source/bin/dub
      export DC=${dmd.out}/bin/dmd
      export HOME=$TMP
      ./test/run-unittest.sh
    '';

    installPhase = ''
        echo -n $inputString > $out
    '';
  };

in

stdenv.mkDerivation rec {
  inherit dubUnittests;
  name = "dub-${dubBuild.version}";
  phases = "installPhase";
  buildInputs = dubBuild.buildInputs;

  installPhase = ''
    mkdir $out
    cp -r --symbolic-link ${dubBuild}/* $out/
  '';

  meta = dubBuild.meta;
}