From: Sam James <sam@gentoo.org>
Subject: [PATCH] Fix -Wdeprecated-non-prototype

xtail.c:365:22: warning: a function declaration without a prototype is deprecated in all versions of C and is treated as a zero-parameter prototype in C2x, conflicting with a previous declaration [-Wdeprecated-non-prototype]
            extern unsigned sleep();
                            ^
/usr/include/unistd.h:464:21: note: conflicting prototype is here
extern unsigned int sleep (unsigned int __seconds);
                    ^
1 warning generated.
--- a/xtail.c
+++ b/xtail.c
@@ -362,7 +362,6 @@ int main(int argc, char *argv[])
 	 * End of checking loop.
 	 */
 	{
-	    extern unsigned sleep();
 	    (void) fflush(stdout);
 	    (void) sleep(SLEEP_TIME);
 	}