anchor.diff:  { lib
   , buildPythonPackage
   , fetchPypi
  +, deprecation
   , pythonOlder
   , packaging
   , pytestCheckHook
  +, tomlkit
   }:
   
   buildPythonPackage rec {
  
positive.code:   disabled = pythonOlder "3.7";
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "276c9f884286695f6ab57a017f4bb9dd4df4f5e232b783050d2aa55b6b9ed650";
    };
  
    propagatedBuildInputs = [ packaging ];
  
    checkInputs = [ pytestCheckHook ];
  
  
negative.code:     export HOME=$(mktemp -d)
    '';
  
    disabledTests = [
      # disable tests depending on network connection
      "test_develop"
      "test_install"
      # Avoid unmainted "mocker" fixture library, and calls to dependent "build" module
      "test_build"
      "test_npm_build"
      "test_create_cmdclass"
      "test_ensure_with_skip_npm"
    ];
  
    pythonImportsCheck = [ "jupyter_packaging" ];
  
  