include netinet/in.h in resolver On some platforms (notably FreeBSD) netinet/in.h is required for the struct in_addr type and IPPROTO_* constants. As this header and both required definitions are documented in IEEE Std 1003.1, this should be safe on all systems.

Frank Zschockelt <lm@freakysoft.de>
Mikael Berthe <mikael@lilotux.net>