Copyright (C) 2015-2020 Yuuki Enomoto <uki@e-yuuki.org>
Copyright (C) 2001-2004 Ken'ichi Fukamachi <fukachan@fml.org>

All rights reserved.  This program is free software; you can
redistribute it and/or modify it under the same terms as NetBSD itself.

Thanks:
  * Ken'ichi Fukamachi
  * Izumi Tsutsui
  * Jun Ebihara
  * Japan NetBSD Users' Group