$OpenBSD: patch-bpf_filter_c,v 1.1 2016/04/05 17:49:17 jasper Exp $
--- bpf_filter.c.orig	Tue Apr  5 19:48:10 2016
+++ bpf_filter.c	Tue Apr  5 19:48:45 2016
@@ -143,8 +143,8 @@ bpf_m_xhalf(m, k, err)
  */
 u_int
 bpf_filter(pc, p, wirelen, buflen)
-	struct bpf_insn *pc;
-	u_char *p;
+	const struct bpf_insn *pc;
+	const u_char *p;
 	u_int wirelen;
 	u_int buflen;
 {
