anchor.diff:     cachetools = buildPythonPackage rec {
        name = "cachetools-${version}";
        version = "1.1.3";
  +     disabled = isPyPy;  # a test fails
   
        src = pkgs.fetchurl {
          url = "https://pypi.python.org/packages/source/c/cachetools/${name}.tar.gz";
  
positive.code:     buildInputs = with self; [
        coverage testtools oslosphinx oslotest
      ];
      preBuild = ''
        sed -i '/ordereddict/d' requirements.txt
      '';
  
  
negative.code:       oslosphinx testtools testrepository oslotest
      ];
  
      patchPhase = ''
        sed -i 's@python@${python.interpreter}@' .testr.conf
      '';
  
      meta = with stdenv.lib; {
        homepage = https://launchpad.net/pycadf;
      };
  