code: def _POTUpdateBuilder(env, **kw):
      
      import SCons.Action
      from SCons.Tool.GettextCommon import _POTargetFactory
      kw['action'] = SCons.Action.Action(_update_pot_file, None)
      kw['suffix'] = '$POTSUFFIX'
      kw['target_factory'] = _POTargetFactory(env, alias='$POTUPDATE_ALIAS').File
      kw['emitter'] = _pot_update_emitter
      return _POTBuilder(**kw)
docs: Creates `POTUpdate` builder object