anchor.diff:  
      google_apputils = buildPythonPackage rec {
       name = "google-apputils-0.4.0";
  +    disabled = isPy3k;
   
       src = fetchurl {
         url = http://pypi.python.org/packages/source/g/google-apputils/google-apputils-0.4.0.tar.gz;
  
positive.code: 
    http_signature = buildPythonPackage (rec {
      name = "http_signature-0.1.4";
  
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/h/http_signature/${name}.tar.gz";
  
negative.code:   protobuf = buildPythonPackage rec {
      inherit (pkgs.protobuf) name src;
  
      propagatedBuildInputs = [ pkgs.protobuf google_apputils  ];
      sourceRoot = "${name}/python";
      
  
      meta = {
        description = "Protocol Buffers are Google's data interchange format.";
  