- dev/wscons/wsconsio.h needs sys/time.h to be present.
- ioctl(2) needs sys/ioctl.h

Index: Programs/beep_wskbd.c
--- Programs/beep_wskbd.c.orig
+++ Programs/beep_wskbd.c
@@ -18,6 +18,8 @@
 
 #include "prologue.h"
 
+#include <sys/ioctl.h>
+#include <sys/time.h>
 #include <dev/wscons/wsconsio.h>
 
 #include "log.h"
