<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _create_mo_file_builder(env, **kw):
 """ Create builder object for `MOFiles` builder """

  import SCons.Action
  # FIXME: What factory use for source? Ours or their?
  kw['action'] = SCons.Action.Action('$MSGFMTCOM','$MSGFMTCOMSTR')
  kw['suffix'] = '$MOSUFFIX'
  kw['src_suffix'] = '$POSUFFIX'
  kw['src_builder'] = '_POUpdateBuilder'
  kw['single_source'] = True 
  return _MOFileBuilder(**kw)