deroff(1) on OpenBSD
The text 1fc53fc8eb5d, as OpenBSD 3.7, OpenBSD 3.6, OpenBSD 3.5, OpenBSD 3.4 shipped it.
remove nroff/troff, eqn, pic and tbl constructs
Flags it lists
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-i -
-k -
-m -
-p -
-w