Index: xlock_check.c
--- xlock_check.c.orig
+++ xlock_check.c
@@ -25,8 +25,6 @@
 #include "idled.h"
 #undef user             /* need user from <sys/user.h> instead */
 
-extern void   logfile();
-
 #ifndef DEBUG
 #  define DEBUG 0
 #endif