anchor.diff:      description = "Read and write PDFs with Python, powered by qpdf";
       license = licenses.mpl20;
       maintainers = with maintainers; [ kiwi dotlambda ];
  -    changelog = "https://github.com/pikepdf/pikepdf/blob/${version}/docs/release_notes.rst";
  +    changelog = "https://github.com/pikepdf/pikepdf/blob/${src.rev}/docs/releasenotes/version${lib.versions.major version}.rst";
     };
   }
  
positive.code: { lib
  , attrs
  , buildPythonPackage
  , defusedxml
  , fetchFromGitHub
  , hypothesis
  , pythonOlder
  , jbig2dec
  , lxml
  , mupdf
  , packaging
  , pillow
  , psutil
  , pybind11
  
negative.code:   ];
  
    propagatedBuildInputs = [
      lxml
      pillow
    ] ++ lib.optionals (pythonOlder "3.8") [
      importlib-metadata
    ];
  
    pythonImportsCheck = [ "pikepdf" ];
  