--- xlock/xlock.h	Tue Mar  9 01:51:30 1999
+++ xlock/xlock.h.BAK	Tue Mar  9 01:49:16 1999
@@ -131,7 +131,7 @@
 #define XSCREENSAVER_PREF 1	/* Disagreements handled with this  :) */
 
 #else /* STANDALONE */
-#include <sys/signal.h>
+#include <signal.h>
 # include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <X11/Xos.h>