cvs(5) on OpenBSD
The text 511f70d94bc1, as OpenBSD 3.5, OpenBSD 3.4, OpenBSD 3.3, OpenBSD 3.2, OpenBSD 3.1, OpenBSD 3.0, OpenBSD 2.9, OpenBSD 2.8, OpenBSD 2.7, OpenBSD 2.6, OpenBSD 2.5, OpenBSD 2.4, OpenBSD 2.3, OpenBSD 2.2, OpenBSD 2.1 shipped it.
Concurrent Versions System support files