Robert P. Day removed 8 gazillion occurrences of "extern" on function
definitions.  (That should only be on prototypes.)
diff --git a/libbb/remove_file.c b/libbb/remove_file.c
index 8b45c58..ee1aaa5 100644
--- a/libbb/remove_file.c
+++ b/libbb/remove_file.c
@@ -30,7 +30,7 @@
 #include <getopt.h>
 #include "libbb.h"
 
-extern int remove_file(const char *path, int flags)
+int remove_file(const char *path, int flags)
 {
 	struct stat path_stat;
 	int path_exists = 1;