unifdef(1) on OpenBSD
The text 53d9da9da52d, as 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 preprocessor conditionals from code
Flags it lists
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-B -
-K -
-M -
-S -
-U -
-V -
-b -
-c -
-d -
-e -
-f -
-h -
-iU -
-k -
-m -
-n -
-o -
-s -
-t