anchor.diff:      name = "hsluv-js";
       builder = builtins.toFile "builder.sh" "
         source $stdenv/setup
  -      $jre/bin/java -jar $closureCompiler/share/java/compiler.jar \\
  +      $closureCompiler/bin/closure-compiler \\
            --js_output_file=$out --compilation_level ADVANCED $jsFile
       ";
     };
  
positive.code:     exportsJs = ./javascript/exports.js;
      builder = builtins.toFile "builder.sh" ''
        source $stdenv/setup
        $haxe/bin/haxe -cp $haxeSrc ${targets} -js compiled.js -D js-classic
  
        echo '(function() {' > $out
        cat compiled.js >> $out
  
negative.code:   ruby = pkgs.ruby;
    maven = pkgs.maven;
    wheel = pkgs.python3Packages.wheel;
    awscli = pkgs.python3Packages.awscli;
    nuget = pkgs.dotnetPackages.Nuget;
    openssl = pkgs.openssl;
  