anchor.diff:  
     meta = with lib; {
       description = "Module for lightweight in-process concurrent programming";
  -    homepage = https://pypi.python.org/pypi/greenlet;
  +    homepage = https://github.com/python-greenlet/greenlet;
       license = licenses.lgpl2;
  -    maintainers = with maintainers; [ ];
  +    maintainers = with maintainers; [
  +      codyopel
  +    ];
       platforms = with platforms;
         x86_64-linux;
     };
  
positive.code: }:
  
  let
    version = "0.4.13";
  in
  buildPythonPackage rec {
    name = "greenlet-${version}";
  
negative.code:   src = fetchPyPi {
      package = "greenlet";
      inherit version;
      sha256 = "9416443e219356e3c31f1f918a91badf2e37acf297e2fa13d24d1cc2380f8fbc";
    };
  
    # Builtin for pypy
  