Fix compilation problems for dnsdiston old linux versions

diff --git a/pdns/dnsdist.cc b/pdns/dnsdist.cc
index 749eeee0b57e74d314850e4dd7140f28ece7a037..6526d1112bfaefba377a9f2c7c26462832b908ff 100644 (file)
--- a/pdns/dnsdist.cc
+++ b/pdns/dnsdist.cc
@@ -993,7 +993,9 @@ try
     if(IsAnyAddress(local)) {
       int one=1;
       setsockopt(cs->udpFD, IPPROTO_IP, GEN_IP_PKTINFO, &one, sizeof(one));     // linux supports this, so why not - might fail on other systems
+#ifdef IPV6_RECVPKTINFO
       setsockopt(cs->udpFD, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one)); 
+#endif
     }
 
     SBind(cs->udpFD, cs->local);