Copyright 1995, Malcom Beattie.
Copyright 1996, Tim Bunce.
Copyright 2010, Reini Urban
All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of either:
a) the GNU General Public License as published by the Free Software
Foundation; version 2, or
b) the "Artistic License" which comes with Perl.