Tested and found to work on:

Linux 1.x/2.x		<crowland@psionic.com>
BSDI 2.x/3.x		<crowland@psionic.com>
OpenBSD 2.x		<crowland@psionic.com>
FreeBSD 3.x 		<angio@aros.net>
HPUX 10.20		<anonymous>
Solaris 2.6+		<various>
AIX			<sauron@the-infinite.org>
SCO			<jonco@sco.COM>
Digital Unix		<ALLAN@mnhep1.hep.umn.edu>
NetBSD			<various>