anchor.diff:  
     fop = callPackage ../tools/typesetting/fop { };
   
  -  gist = callPackage ../tools/text/gist { };
  +  # Evaluation broken by recent ruby changes.
  +  # gist = callPackage ../tools/text/gist { };
   
     mcrl = callPackage ../tools/misc/mcrl { };
   
  
positive.code: 
    fsharp = callPackage ../development/compilers/fsharp {};
  
    gem-nix = callPackage ../tools/package-management/gem-nix { };
  
    go_1_0 = callPackage ../development/compilers/go { };
  
  
negative.code:   };
    defaultGemConfig = callPackage ../development/interpreters/ruby/bundler-env/default-gem-config.nix { };
    buildRubyGem = callPackage ../development/interpreters/ruby/gem.nix { };
    # Evaluation broken by recent ruby changes.
    # loadRubyEnv = callPackage ../development/interpreters/ruby/load-ruby-env.nix { };
    bundlerEnv = callPackage ../development/interpreters/ruby/bundler-env { };
  
    ruby_1_8_7 = callPackage ../development/interpreters/ruby/ruby-1.8.7.nix { };
  