Robert P. Day removed 8 gazillion occurrences of "extern" on function
definitions.  (That should only be on prototypes.)
diff --git a/libbb/warn_ignoring_args.c b/libbb/warn_ignoring_args.c
index a1fa528..cc35fe2 100644
--- a/libbb/warn_ignoring_args.c
+++ b/libbb/warn_ignoring_args.c
@@ -22,7 +22,7 @@
 
 #include <libbb.h>
 
-extern void bb_warn_ignoring_args(int n)
+void bb_warn_ignoring_args(int n)
 {
 	if (n) {
 		bb_perror_msg("ignoring all arguments");