anchor.diff:        write ics data in a developer friendly way.
       '';
       homepage = "http://icspy.readthedocs.org/en/stable/";
  -    changelog = "https://github.com/C4ptainCrunch/ics.py/releases/tag/v${version}";
  +    changelog = "https://github.com/ics-py/ics-py/releases/tag/v${version}";
       license = licenses.asl20;
       maintainers = with maintainers; [ primeos ];
     };
  -
   }
  
positive.code:   disabled = pythonOlder "3.6";
  
    src = fetchFromGitHub {
      owner = "C4ptainCrunch";
      repo = "ics.py";
      rev = "v${version}";
      sha256 = "0rrdc9rcxc3ys6rml81b8m8qdlisk78a34bdib0wy65hlkmyyykn";
    };
  
    propagatedBuildInputs = [ tatsu arrow ];
  
    postPatch = ''
      substituteInPlace requirements.txt \
        --replace "arrow>=0.11,<0.15" "arrow"
      substituteInPlace setup.cfg --replace "--pep8" ""
    '';
  
    checkInputs = [ pytestCheckHook pytest-flakes ];
  
    meta = with lib; {
      description = "Pythonic and easy iCalendar library (RFC 5545)";
  
negative.code: { lib
  , buildPythonPackage
  , fetchFromGitHub
  , pythonOlder
  , tatsu
  , arrow
  , pytestCheckHook
  , pytest-flakes
  }:
  
  buildPythonPackage rec {
  