anchor.diff:  
     doCheck = false;
   
  -  buildInputs = [ setuptools_scm ];
  +  nativeBuildInputs = [ setuptools_scm ];
     propagatedBuildInputs = [
       six
       importlib-metadata
  
positive.code:     jaraco_itertools
      jaraco_collections
    ];
  }
  
negative.code: { lib, buildPythonPackage, fetchPypi, isPy3k
  , six, jaraco_logging, jaraco_text, jaraco_stream, pytz, jaraco_itertools
  , setuptools_scm, jaraco_collections, importlib-metadata
  }:
  