deroff(1) on OpenBSD
The text 2d7d4419e873, as OpenBSD 4.1, OpenBSD 4.0, OpenBSD 3.9, OpenBSD 3.8 shipped it.
remove nroff/troff, eqn, pic and tbl constructs
Flags it lists
-
-i -
-k -
-m -
-p -
-w