_rand48(3) on FreeBSD
The text f0a1cf7abcd9, as FreeBSD 2.2.6-RELEASE, FreeBSD 2.2.5-RELEASE, FreeBSD 2.2.2-RELEASE, FreeBSD 2.1.7.1-RELEASE, FreeBSD 2.1.7-RELEASE, FreeBSD 2.1.5-RELEASE shipped it.
pseudo random number generators and initialization routines