anchor.diff:          sha256 = "18hgl4wz3rhaklkwaxl8gm70h7l8k225f86da682kafawrr8zhv4";
         };
   
  -  buildInputs = with python27Packages; [
  -    (python27.withPackages(ps: [ cffi cryptography pyopenssl ]))
  -  ];
  +  buildInputs = [python27 makeWrapper];
   
     installPhase = ''
       mkdir -p $out/bin $out/share/
  
positive.code: { stdenv, fetchzip, python27, python27Packages }:
  
  assert stdenv.system == "x86_64-linux" || stdenv.system == "x86_64-darwin";
  
  stdenv.mkDerivation rec {
    name = "google-app-engine-go-sdk-${version}";
  
negative.code: 
      # create wrappers with correct env
      for i in goapp appcfg.py; do
        makeWrapper "$out/share/go_appengine/$i" "$out/bin/$i" \
          --prefix PATH : "${python27}/bin" \
          --prefix PYTHONPATH : "$(toPythonPath ${cffi}):$(toPythonPath ${cryptography}):$(toPythonPath ${pyopenssl})"
      done
    '';
  
  