m4(1) on OpenBSD
The text b27cca1e69ad, as OpenBSD 6.8, OpenBSD 6.7, OpenBSD 6.6, OpenBSD 6.5, OpenBSD 6.4, OpenBSD 6.3, OpenBSD 6.2 shipped it.
macro language processor
Flags it lists
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-D -
-E -
-I -
-P -
-U -
-d -
-g -
-o -
-s -
-t