anchor.diff:  
     semantic = buildPythonPackage rec {
       name = "semantic-1.0.3";
  -
  -    propagatedBuildInputs = with pythonPackages; [ quantities numpy ];
  +    
  +    disabled = isPy3k;
  +
  +    propagatedBuildInputs = [ quantities numpy ];
   
       src = fetchurl {
         url = "https://pypi.python.org/packages/source/s/semantic/semantic-1.0.3.tar.gz";
  
positive.code:   mpd = buildPythonPackage rec {
      name = "python-mpd-0.3.0";
  
      src = fetchurl {
        url = "https://pypi.python.org/packages/source/p/python-mpd/python-mpd-0.3.0.tar.gz";
        md5 = "5b3849b131e2fb12f251434597d65635";
  
negative.code:     };
  
       # test fail (timezone test fail)
       doCheck = false;
  
      meta = with pkgs.stdenv.lib; {
        description = "Tzinfo object for the local timezone.";
  