anchor.diff:  
   buildPythonPackage rec {
     pname = "pikepdf";
  -  version = "5.1.4";
  +  version = "5.1.5";
     format = "setuptools";
   
     disabled = pythonOlder "3.7";
  
positive.code:     postFetch = ''
        rm "$out/.git_archival.txt"
      '';
      hash = "sha256-nCzG1QYwERKo/T16hEGIG//PwSrpWRmKLXdj42WGyls=";
    };
  
    patches = [
  
negative.code: 
    propagatedBuildInputs = [
      lxml
      packaging
      pillow
    ] ++ lib.optionals (pythonOlder "3.8") [
      importlib-metadata
  