LIST_NEXT(3) on FreeBSD
The text 554f8fb90b6c, as FreeBSD 4.11-RELEASE, FreeBSD 4.10-RELEASE, FreeBSD 4.9-RELEASE, FreeBSD 4.8-RELEASE, FreeBSD 4.7-RELEASE, FreeBSD 4.6.2-RELEASE, FreeBSD 4.6-RELEASE, FreeBSD 4.5-RELEASE shipped it.
implementations of singly-linked lists, singly-linked tail queues, lists, tail queues, and circular queues