anchor.diff:    networking-hyperv = buildPythonPackage rec {
       name = "networking-hyperv-${version}";
       version = "2015.1.0";
  +    disabled = isPy3k;  # failing tests
   
       src = pkgs.fetchurl {
         url = "https://pypi.python.org/packages/source/n/networking-hyperv/${name}.tar.gz";
  
positive.code:     buildInputs = with self; [
       requests-mock
      ];
  
      meta = with stdenv.lib; {
        homepage = "http://wiki.openstack.org/OpenStackClient";
  
negative.code:     # TODO: check if removing this test is really harmless
      preCheck = ''
        substituteInPlace novaclient/tests/unit/v2/test_servers.py --replace "test_get_password" "noop"
      '';
  
      patchPhase = ''
        sed -i 's@python@${python.interpreter}@' .testr.conf
      '';
  
      meta = {
  