docs: def _prepare(self):
          """ Setup initial requirements for daemon run.
              """
  
          super(TaskRunner, self)._prepare()
          self._setup_root_plugins()
  
          # set the default x-window display for non-mac systems
          if not sys.platform.lower().startswith('darwin'):
              if not 'DISPLAY' in os.environ:
                  os.environ['DISPLAY'] = ':0.0'