curs_util(3) on FreeBSD

The text ab4f58ee6c00, as FreeBSD 2.1.7.1-RELEASE, FreeBSD 2.1.7-RELEASE, FreeBSD 2.1.5-RELEASE, FreeBSD 2.0.5-RELEASE shipped it.

miscellaneous ncurses utility routines

curs_util(3) on FreeBSD now