anchor.diff:  
   buildPythonPackage rec {
     pname = "pikepdf";
  -  version = "4.2.0";
  +  version = "4.3.0";
     disabled = ! isPy3k;
   
     src = fetchFromGitHub {
  
positive.code:     extraPostFetch = ''
        rm "$out/.git_archival.txt"
      '';
      sha256 = "sha256-8ForstZzRpr2TnOgK/+y4aF3R7XMEYfcSQhntA765Co=";
    };
  
    patches = [
  
negative.code:   propagatedBuildInputs = [
      defusedxml
      lxml
      packaging
      pillow
      setuptools
    ];
  