unifdef(1) on FreeBSD
The text 4fe1efb3f2a8, as FreeBSD 4.11-RELEASE, FreeBSD 4.10-RELEASE, FreeBSD 4.9-RELEASE, FreeBSD 4.8-RELEASE shipped it.
remove preprocessor conditionals from code
Flags it lists
-
-D -
-I -
-U -
-c -
-e -
-iD -
-iU -
-k -
-l -
-s -
-t