anchor.diff: -{ lib, buildPythonPackage, fetchPypi, pythonOlder
  +{ lib
  +, buildPythonPackage
  +, fetchPypi
  +, pythonOlder
   , attrs
   , audio-metadata
   , importlib-metadata
  
positive.code: buildPythonPackage rec {
    pname = "google-music-proto";
    version = "2.10.0";
    disabled = pythonOlder "3.6";
  
    src = fetchPypi {
      inherit pname version;
  
negative.code:   postPatch = ''
      sed -i -e "/audio-metadata/c\'audio-metadata'," -e "/marshmallow/c\'marshmallow'," setup.py
      substituteInPlace setup.py \
        --replace "'attrs>=18.2,<19.4'" "'attrs'"
    '';
  
    propagatedBuildInputs = [
  