anchor.diff:        nose
         modules.sqlite3
       ];
  -    
  +
       # Test does not work on Py3k because it calls 'python'.
       # https://github.com/nipy/nibabel/issues/341
       preCheck = ''
  
positive.code:   protobuf2_5 = self.protobufBuild pkgs.protobuf2_5;
    protobufBuild = protobuf: buildPythonPackage rec {
      inherit (protobuf) name src;
      disabled = isPy3k;
  
      propagatedBuildInputs = with self; [ protobuf google_apputils ];
  
  
negative.code: 
    importlib = buildPythonPackage rec {
      name = "importlib-1.0.2";
  
      disabled = (!isPy26) || isPyPy;
  
      src = pkgs.fetchurl {
        url = "http://pypi.python.org/packages/source/i/importlib/importlib-1.0.2.tar.gz";
        md5 = "4aa23397da8bd7c7426864e88e4db7e1";
  