$OpenBSD: patch-src_filter_c,v 1.3 2021/07/04 14:31:46 tb Exp $

Index: src/filter.c
--- src/filter.c.orig
+++ src/filter.c
@@ -51,7 +51,7 @@ $Id: patch-src_filter_c,v 1.3 2021/07/04 14:31:46 tb Exp $
 #endif /* HAVE_SYS_WAIT_H */
 #endif /* HAVE_WORKING_FORK */
 
-
+#include <signal.h>
 
 
 
