anchor.diff:    postPatch = ''
       chmod +x tools/protoc-gen-mypy.sh.in
       patchShebangs tools/protoc-gen-mypy.sh.in tools/protoc-gen-mypy.py
  +
  +    substituteInPlace setup.py \
  +      --replace "setup_requires.append('pytest-runner')" ""
     '';
   
     preBuild = ''
  
positive.code: , six
  , typing-extensions
  , pytestCheckHook
  , pytestrunner
  , nbval
  , tabulate
  }:
  
negative.code: 
    checkInputs = [
      pytestCheckHook
      nbval
      tabulate
    ];
  