anchor.diff: -{ stdenv, fetchzip, python27, python27Packages, makeWrapper }:
  +{ stdenv, fetchzip, python3Packages, makeWrapper }:
   
  -with python27Packages;
  +with python3Packages;
   
   stdenv.mkDerivation rec {
     pname = "google-app-engine-go-sdk";
  
positive.code:     # create wrappers with correct env
      for i in goapp go-app-stager *.py; do
        makeWrapper "$out/share/go_appengine/$i" "$out/bin/$i" \
          --prefix PATH : "${python27}/bin" \
          --prefix PYTHONPATH : "$(toPythonPath ${cffi}):$(toPythonPath ${cryptography}):$(toPythonPath ${pyopenssl})"
      done
    '';
  
negative.code:         sha256 = "0s8sqyc72lnc7dxd4cl559gyfx83x71jjpsld3i3nbp3mwwamczp";
        };
  
    buildInputs = [ python makeWrapper ];
  
    installPhase = ''
      mkdir -p $out/bin $out/share/
  