anchor.diff:  { lib
   , stdenv
   , buildPythonPackage
  -, fetchPypi
  +, fetchFromGitHub
   , html5lib
   , isodate
   , networkx
  
positive.code: 
    disabled = pythonOlder "3.7";
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "8dbfa0af2990b98471dacbc936d6494c997ede92fd8ed693fb84ee700ef6f754";
    };
  
    propagatedBuildInputs = [
  
negative.code:     nose
      tabulate
      pytestCheckHook
    ];
  
    pytestFlagsArray = [
      # requires network access
      "--deselect rdflib/__init__.py::rdflib"
      "--deselect test/jsonld/test_onedotone.py::test_suite"
    ];
  
    disabledTests = [
  