anchor.diff:    nodejs = pkgs.nodejs;
     gnupg = pkgs.gnupg;
     luarocks = pkgs.luarocks;
  -  python3 = pkgs.python3;
     ruby = pkgs.ruby;
     maven = pkgs.maven;
  -  wheel = pkgs.python3Packages.wheel;
     awscli = pkgs.python3Packages.awscli;
     nuget = pkgs.dotnetPackages.Nuget;
     openssl = pkgs.openssl;
  
positive.code:   snapshotRev4 = ./snapshots/snapshot-rev4.json;
    closureCompiler = pkgs.closurecompiler;
  
    # v0.0.2
    pythonSrc = pkgs.fetchzip {
      url = "https://github.com/hsluv/hsluv-python/archive/287439082df640fe469a1af5b683bcd7a14c4b54.zip";
  
negative.code:     '';
    };
  
    haxeTest = pkgs.stdenv.mkDerivation rec {
      inherit haxe haxeSrc haxeTestSrc snapshotRev4;
      name = "hsluv-haxe-test";
      buildInputs = [haxe];
      builder = builtins.toFile "builder.sh" ''
        source $stdenv/setup
        haxe -cp $haxeSrc -cp $haxeTestSrc -main RunTests -resource $snapshotRev4@snapshot-rev4 --interp
        touch $out
      '';
    };
  