Robert P. Day removed 8 gazillion occurrences of "extern" on function
definitions.  (That should only be on prototypes.)
diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c
index 00abe10..126caf6 100644
--- a/util-linux/hwclock.c
+++ b/util-linux/hwclock.c
@@ -192,7 +192,7 @@
 #define HWCLOCK_OPT_HCTOSYS		0x08
 #define HWCLOCK_OPT_SYSTOHC		0x10
 
-extern int hwclock_main ( int argc, char **argv )
+int hwclock_main ( int argc, char **argv )
 {
 	unsigned long opt;
 	int utc;