From dcc6049444f5e12e0d0fcc4cfbb244c08b4c20b0 Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Wed, 14 Apr 2010 14:46:21 +0200
Subject: Fixes IPv6 build on older systems.

---
 sysdep/unix/io.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'sysdep/unix')

diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c
index d1fad1ff..c9e6fe13 100644
--- a/sysdep/unix/io.c
+++ b/sysdep/unix/io.c
@@ -668,6 +668,16 @@ get_sockaddr(struct sockaddr_in *sa, ip_addr *a, unsigned *port, int check)
 #define CMSG_RX_SPACE CMSG_SPACE(sizeof(struct in6_pktinfo))
 #define CMSG_TX_SPACE CMSG_SPACE(sizeof(struct in6_pktinfo))
 
+/*
+ * RFC 2292 uses IPV6_PKTINFO for both the socket option and the cmsg
+ * type, RFC 3542 changed the socket option to IPV6_RECVPKTINFO. If we
+ * don't have IPV6_RECVPKTINFO we suppose the OS implements the older
+ * RFC and we use IPV6_PKTINFO.
+ */
+#ifndef IPV6_RECVPKTINFO
+#define IPV6_RECVPKTINFO IPV6_PKTINFO
+#endif
+
 static char *
 sysio_register_cmsgs(sock *s)
 {
-- 
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