Robert P. Day removed 8 gazillion occurrences of "extern" on function
definitions.  (That should only be on prototypes.)
diff --git a/archival/libunarchive/open_transformer.c b/archival/libunarchive/open_transformer.c
index fb149fc..0d362a5 100644
--- a/archival/libunarchive/open_transformer.c
+++ b/archival/libunarchive/open_transformer.c
@@ -20,7 +20,7 @@
 #include "libbb.h"
 
 /* transformer(), more than meets the eye */
-extern int open_transformer(int src_fd, int (*transformer)(int src_fd, int dst_fd))
+int open_transformer(int src_fd, int (*transformer)(int src_fd, int dst_fd))
 {
 	int fd_pipe[2];
 	int pid;