anchor.diff:        sha256 = "a39ce0e321e40e9758bf7b9128d316c71b35b80eabc84f13df492083bb6f1cc6";
       };
   
  -    buildPhase = "python setup.py build";
  +    buildPhase = "${python}/bin/${python.executable} setup.py build";
       doCheck = false;
       postInstall = "ln -s $out/bin/osc-wrapper.py $out/bin/osc";
   
  
positive.code: 
    pyro3 = buildPythonPackage (rec {
      name = "Pyro-3.16";
  
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/P/Pyro/${name}.tar.gz";
  
negative.code: 
    tarsnapper = buildPythonPackage rec {
      name = "tarsnapper-0.2.1";
      disabled = isPy3k;
  
      src = fetchgit {
        url = https://github.com/miracle2k/tarsnapper.git;
  