anchor.diff:  
     zodbpickle = pythonPackages.buildPythonPackage rec {
       name = "zodbpickle-0.5.2";
  +    disabled = isPyPy; # https://github.com/zopefoundation/zodbpickle/issues/10
   
       src = fetchurl {
         url = "https://pypi.python.org/packages/source/z/zodbpickle/${name}.tar.gz";
  
positive.code:     };
    };
  
    ipdb = buildPythonPackage {
      name = "ipdb-0.7";
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/i/ipdb/ipdb-0.7.tar.gz";
        md5 = "d879f9b2b0f26e0e999809585dcaec61";
      };
      propagatedBuildInputs = [ pythonPackages.ipythonLight ];
    };
  
negative.code:       '';
        license = "bsd";
      };
    };
  
    oauth2 = buildPythonPackage (rec {
      name = "oauth2-1.5.211";
  