$NetBSD$

* include <signal.h>

--- cf.c.orig
+++ cf.c
@@ -15,6 +15,7 @@
 #include <dirent.h>
 #include <curses.h>
 #include <unistd.h>
+#include <signal.h>
 #include <stdlib.h>
 #include <string.h>
 #include <strings.h>
