unifdef(1) on OpenBSD
The text bf436ec61123, as OpenBSD 4.1, OpenBSD 4.0, OpenBSD 3.9, OpenBSD 3.8, OpenBSD 3.7, OpenBSD 3.6, OpenBSD 3.5 shipped it.
remove preprocessor conditionals from code
Flags it lists
-
-D -
-U -
-c -
-e -
-iD -
-iU -
-k -
-l -
-s -
-t