anchor.diff:        url = "http://pypi.python.org/packages/source/P/PrettyTable/${name}.tar.bz2";
         sha1 = "ad346a18d92c1d95f2295397c7a8a4f489e48851";
       };
  -        
  +
       buildInputs = [ pkgs.glibcLocales ];
   
       preCheck = ''
  
positive.code:     meta = with stdenv.lib; {
        description = "Module for reading vCard and vCalendar files";
        homepage = http://vobject.skyhouseconsulting.com/;
        license = licenses.apache;
        maintainers = [ maintainers.DamienCassou ];
      };
    };
  
negative.code:       url = "https://pypi.python.org/packages/source/g/gevent/${name}.tar.gz";
        sha256 = "0hyzfb0gcx9pm5c2igan8y57hqy2wixrwvdjwsaivxsqs0ay49s6";
      };
  
      patches = [ ../development/python-modules/gevent_sslwrap.patch ];
  
      buildInputs = with self; [ pkgs.libev ];
  