anchor.diff:  
   buildPythonPackage rec {
     pname = "cssutils";
  -  version = "2.4.0";
  +  version = "2.4.2";
   
     disabled = pythonOlder "3.7";
   
  
positive.code: , fetchPypi
  , setuptools
  , setuptools-scm
  , toml
  , importlib-metadata
  , cssselect
  , lxml
  , mock
  , pytestCheckHook
  
negative.code: 
    src = fetchPypi {
      inherit pname version;
      sha256 = "877818bfa9668cc535773f46e6b6a46de28436191211741b3f7b4aaa64d9afbb";
    };
  
    nativeBuildInputs = [
      setuptools
      setuptools-scm
    ];
  
    propagatedBuildInputs = lib.optionals (pythonOlder "3.8") [
  