anchor.diff:    pygtk = import ../development/python-modules/pygtk {
       inherit (pkgs) fetchurl stdenv pkgconfig gtk;
       inherit python buildPythonPackage pygobject pycairo isPy3k;
  -  }; 
  +  };
   
     # XXX: how can we get an override here?
     #pyGtkGlade = pygtk.override {
  
positive.code:   gevent = buildPythonPackage rec {
      name = "gevent-1.0.1";
      disabled = isPy3k;
      
      src = fetchurl {
        url = "https://pypi.python.org/packages/source/g/gevent/${name}.tar.gz";
        sha256 = "0hyzfb0gcx9pm5c2igan8y57hqy2wixrwvdjwsaivxsqs0ay49s6";
  
negative.code:       url = "http://pypi.python.org/packages/source/W/WebTest/WebTest-${version}.zip";
        md5 = "49314bdba23f4d0bd807facb2a6d3f90";
      };
  
      preConfigure = ''
        substituteInPlace setup.py --replace "nose<1.3.0" "nose"
      '';
  