anchor.diff:  
   
     dateutil = buildPythonPackage (rec {
  -    name = "dateutil-1.5";
  +    name = "dateutil-2.1";
   
       src = fetchurl {
         url = "http://pypi.python.org/packages/source/p/python-dateutil/python-${name}.tar.gz";
  -      sha256 = "02dhw57jf5kjcp7ng1if7vdrbnlpb9yjmz7wygwwvf3gni4766bg";
  -    };
  +      sha256 = "1vlx0lpsxjxz64pz87csx800cwfqznjyr2y7nk3vhmzhkwzyqi2c";
  +    };
  +
  +    propagatedBuildInputs = [ six ];
   
       meta = {
         description = "Powerful extensions to the standard datetime module";
  
positive.code:     };
    });
  
  
    logilab_astng = buildPythonPackage rec {
      name = "logilab-astng-0.24.1";
  
negative.code:   };
  
  
    requests = buildPythonPackage rec {
      name = "requests-1.1.0";
  
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/r/requests/${name}.tar.gz";
        md5 = "a0158815af244c32041a3147ee09abf3";
      };
  
      meta = {
        description = "Requests is an Apache2 Licensed HTTP library, written in Python, for human beings..";
        homepage = http://docs.python-requests.org/en/latest/;
      };
    };
  
    requests014 = buildPythonPackage rec {
      name = "requests-0.14.1";
  
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/r/requests/${name}.tar.gz";
        md5 = "3de30600072cbc7214ae342d1d08aa46";
      };
  
      meta = {
        description = "Requests is an Apache2 Licensed HTTP library, written in Python, for human beings..";
        homepage = http://docs.python-requests.org/en/latest/;
      };
    };
  
  
    reviewboard = buildPythonPackage rec {
      name = "ReviewBoard-1.6.13";
  
  