deroff(1) on OpenBSD
The text 68722aac399a, as OpenBSD 7.1, OpenBSD 7.0, OpenBSD 6.9, OpenBSD 6.8, OpenBSD 6.7, OpenBSD 6.6, OpenBSD 6.5, OpenBSD 6.4, OpenBSD 6.3 shipped it.
remove nroff/troff, eqn, pic and tbl constructs
Flags it lists
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-i -
-k -
-m -
-p -
-w