anchor.diff:  
   buildPythonPackage rec {
     pname = "license-expression";
  -  version = "21.6.14";
  +  version = "30.0.0";
   
     disabled = pythonOlder "3.6";
   
  
positive.code:     pytestCheckHook
    ];
  
    pythonImportsCheck = [ "license_expression" ];
  
    meta = with lib; {
      description = "Utility library to parse, normalize and compare License expressions for Python";
      homepage = "https://github.com/nexB/license-expression";
      license = licenses.asl20;
      maintainers = with maintainers; [ fab ];
  
negative.code:     owner = "nexB";
      repo = "license-expression";
      rev = "v${version}";
      hash = "sha256-tGXNZm9xH8sXa7dtBFsTzGgT+hfbmkwps7breR7KUWU=";
    };
  
    dontConfigure = true;
  