anchor.diff:        rev = "refs/tags/${name}";
         sha256 = "16jb8x5hbs3g4dq10y6rqc1005bnffwnlws8x7j1d96n7k9mjn8h";
       };
  +
  +    patchPhase = ''
  +      substituteInPlace setup.py --replace "version=versioneer.get_version()" "version='${version}'"
  +    '';
   
       propagatedBuildInputs = with self;
         [ pyptlib argparse twisted pycrypto pyyaml ];
  
positive.code:     checkPhase = ''
        # Not worth the trouble
        rm test/with_dummyserver/test_proxy_poolmanager.py
        # pypy: https://github.com/shazow/urllib3/issues/736
        rm test/with_dummyserver/test_connectionpool.py
  
  
negative.code:       url = "http://pypi.python.org/packages/source/p/pyrax/${name}.tar.gz";
        sha256 = "0hvim60bhgfj91m7pp8jfmb49f087xqlgkqa505zw28r7yl0hcfp";
      };
  
      propagatedBuildInputs = with self; [ requests2 ];
  
      meta = {
        homepage    = "https://github.com/rackspace/pyrax";
  