[http://netbsd.gw.com/cgi-bin/man-cgi?getgroupmembership NetBSD manual page for getgrouplist(3) and getgroupmembership(3)]

[http://www.freebsd.org/cgi/man.cgi?query=getgrouplist&apropos=0&sektion=0&manpath=FreeBSD+6.2-RELEASE&format=html FreeBSD manual page for getgrouplist(3)]

[http://lists.freebsd.org/pipermail/freebsd-current/2007-July/075131.html PATCH to add getgroupmembership(3) to FreeBSD]

1. http://osdir.com/ml/netbsd.devel.userlevel/2004-12/msg00001.html
2. http://lists.freebsd.org/pipermail/freebsd-current/2006-May/063548.html
3. http://lists.freebsd.org/pipermail/freebsd-current/2006-March/061413.html

[https://bugzilla.samba.org/show_bug.cgi?id=4850 PATCH Provide getgroupmembership for FreeBSD NSS]