anchor.diff:      };
     };
   
  -  
  +
     BTrees = pythonPackages.buildPythonPackage rec {
       name = "BTrees-4.0.8";
  -    
  +
       patches = [ ./../development/python-modules/btrees_interger_overflow.patch ];
   
       propagatedBuildInputs = [ persistent zope_interface transaction ];
  
positive.code: 
    avro3k = pkgs.lowPrio (buildPythonPackage (rec {
      name = "avro3k-1.7.7-SNAPSHOT";
      
      disabled = (!isPy3k);
      
      src = fetchurl {
        url = "https://pypi.python.org/packages/source/a/avro3k/${name}.tar.gz";
        sha256 = "15ahl0irwwj558s964abdxg4vp6iwlabri7klsm2am6q5r0ngsky";
  
negative.code:       homepage = https://pypi.python.org/pypi/ZEO;
      };
    };
  
    random2 = pythonPackages.buildPythonPackage rec {
      name = "random2-1.0.1";
  
  