anchor.diff:          installFlags = stdenv.lib.optionalString docSupport "install-doc";
           # Bundler tries to create this directory
           postInstall = ''
  -          # Update rubygems
  -          pushd rubygems
  -          chmod +w bundler/bundler.gemspec
  -          ${buildRuby} setup.rb --destdir $GEM_HOME
  -          popd
  -
             # Remove unnecessary groff reference from runtime closure, since it's big
             sed -i '/NROFF/d' $out/lib/ruby/*/*/rbconfig.rb
   
  
positive.code:     baseruby = self.override {
        useRailsExpress = false;
        docSupport = false;
      };
      self = lib.makeOverridable (
        { stdenv, buildPackages, lib
        , fetchurl, fetchFromSavannah, fetchFromGitHub
        , useRailsExpress ? true
        , zlib, zlibSupport ? true
        , openssl, opensslSupport ? true
        , gdbm, gdbmSupport ? true
  
negative.code:             patchLevel = ver.patchLevel;
            }).${ver.majMinTiny};
  
          postUnpack = opString rubygemsSupport ''
            cp -r ${rubygems} $sourceRoot/rubygems
          '';
  
  