anchor.diff:    enableParallelBuilding = true;
   
     installPhase = ''
  +    runHook preInstall
  +
       mkdir -p $out/bin $out/libexec
       install git-cinnabar-helper $out/bin
       install git-cinnabar git-remote-hg $out/libexec
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "git-cinnabar";
    version = "0.5.4";
  
    src = fetchFromGitHub {
      owner = "glandium";
      repo = "git-cinnabar";
      rev = version;
      sha256 = "1cjn2cc6mj4m736wxab9s6qx83p5n5ha8cr3x84s9ra6rxs8d7pi";
      fetchSubmodules = true;
    };
  
  
negative.code:             --prefix GIT_CINNABAR_EXPERIMENTS , python3 \
              --set PYTHONPATH ${mercurial}/${python3.sitePackages}
      done
  
      runHook postInstall
    '';
  
    meta = with lib; {
      homepage = "https://github.com/glandium/git-cinnabar";
      description = "git remote helper to interact with mercurial repositories";
      license = licenses.gpl2Only;
      maintainers = with maintainers; [ qyliss ];
      platforms = platforms.all;
    };
  