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