anchor.diff:  
       # create wrappers with correct env
       for i in goapp appcfg.py; do
  -      ln -s "$out/share/go_appengine/$i" "$out/bin/$i"
  +      makeWrapper "$out/share/go_appengine/$i" "$out/bin/$i" \
  +        --prefix PATH : "${python27}/bin" \
  +        --prefix PYTHONPATH : "$(toPythonPath ${cffi}):$(toPythonPath ${cryptography}):$(toPythonPath ${pyopenssl})"
       done
     '';
   
  
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:         sha256 = "18hgl4wz3rhaklkwaxl8gm70h7l8k225f86da682kafawrr8zhv4";
        };
  
    buildInputs = [python27 makeWrapper];
  
    installPhase = ''
      mkdir -p $out/bin $out/share/
  