anchor.diff:  
     propagatedBuildInputs = [
       lxml
  +    packaging
       pillow
     ] ++ lib.optionals (pythonOlder "3.8") [
       importlib-metadata
  
positive.code: 
  buildPythonPackage rec {
    pname = "pikepdf";
    version = "5.1.4";
    format = "setuptools";
  
    disabled = pythonOlder "3.7";
  
negative.code: , jbig2dec
  , lxml
  , mupdf
  , packaging
  , pillow
  , psutil
  , pybind11
  