From 9f8bee33f73667371506c0d693ba4288112d98e7 Mon Sep 17 00:00:00 2001
From: Pieter Lexis <pieter.lexis@powerdns.com>
Date: Wed, 29 Apr 2015 13:13:43 +0200
Subject: [PATCH] Fix compilation issues on ancient linux versions

---
 pdns/pdns_recursor.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pdns/pdns_recursor.cc b/pdns/pdns_recursor.cc
index 23fca87bed..387139d55e 100644
--- a/pdns/pdns_recursor.cc
+++ b/pdns/pdns_recursor.cc
@@ -1181,7 +1181,9 @@ void makeUDPServerSockets()
     if(IsAnyAddress(sin)) {
       int one=1;
       setsockopt(fd, IPPROTO_IP, GEN_IP_PKTINFO, &one, sizeof(one));     // linux supports this, so why not - might fail on other systems
+#ifdef IPV6_RECVPKTINFO
       setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one)); 
+#endif
       if(sin.sin6.sin6_family == AF_INET6 && setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)) < 0) {
 	L<<Logger::Error<<"Failed to set IPv6 socket to IPv6 only, continuing anyhow: "<<strerror(errno)<<endl;
       }
-- 
2.47.2