$OpenBSD: patch-ifne_c,v 1.1.1.1 2011/05/04 14:11:59 sthen Exp $
--- ifne.c.orig	Sun May  1 13:12:58 2011
+++ ifne.c	Sun May  1 13:13:20 2011
@@ -23,6 +23,7 @@
 #include <sys/wait.h>
 #include <sys/types.h>
 #include <string.h>
+#include <signal.h>
 #define streq(a, b) (!strcmp((a), (b)))
 
 static void stdin_to_stream(char *buf, ssize_t r, FILE *outf) {