anchor.diff:        --replace '@@taskwarrior@@' '${pkgs.taskwarrior}'
     '';
   
  -  # https://github.com/ralphbean/taskw/issues/98
  -  doCheck = false;
  +  buildInputs = [ pkgs.taskwarrior ];
   
  -  buildInputs = [ nose pkgs.taskwarrior tox ];
     propagatedBuildInputs = [ six python-dateutil kitchen pytz ];
  +
  +  checkInputs = [ pytestCheckHook ];
   
     meta = with lib; {
       homepage =  "https://github.com/ralphbean/taskw";
  
positive.code:     license = licenses.gpl3Plus;
      maintainers = with maintainers; [ pierron ];
    };
  
  }
  
negative.code: , six
  , python-dateutil
  , kitchen
  , pytestCheckHook
  , pytz
  , pkgs
  }:
  
  buildPythonPackage rec {
    pname = "taskw";
    version = "2.0.0";
  
    src = fetchPypi {
      inherit pname version;
  