unifdef(1) on OpenBSD
The text a8250041859a, as OpenBSD 4.8, OpenBSD 4.7, OpenBSD 4.6, OpenBSD 4.5, OpenBSD 4.4, OpenBSD 4.3, OpenBSD 4.2 shipped it.
remove preprocessor conditionals from code
Flags it lists
-
-U -
-c -
-e -
-iU -
-k -
-l -
-s -
-t