anchor.diff:    postPatch = ''
       sed -i '/^addopts/d' pyproject.toml
     '';
  +
  +  nativeBuildInputs = [
  +    flit-core
  +  ];
   
     propagatedBuildInputs = [ tinycss2 ];
   
  
positive.code: { lib
  , buildPythonPackage
  , pythonOlder
  , fetchPypi
  , tinycss2
  
negative.code: buildPythonPackage rec {
    pname = "cssselect2";
    version = "0.5.0";
    format = "pyproject";
    disabled = pythonOlder "3.5";
  
    src = fetchPypi {
  