--- configure.ac.orig	2009-07-24 16:10:32.964084488 +0800
+++ configure.ac	2009-07-24 16:11:30.793631222 +0800
@@ -51,6 +51,14 @@
 AC_DEFINE([_FORTIFY_SOURCE], [2], [Define to `2' to get GNU/libc warnings.])
 AC_DEFINE([NICEAPI_EXPORT], [ ], [Public library function implementation])
 AC_CHECK_HEADERS([arpa/inet.h net/in.h ifaddrs.h])
+AC_SEARCH_LIBS([socket],[socket inet])
+case $host in
+  *-*-solaris* )
+     AC_DEFINE(_XOPEN_SOURCE_EXTENDED, 1, Needed to get declarations for msg_control and msg_controllen on Solaris)
+     AC_DEFINE(_XOPEN_SOURCE,          2, Needed to get declarations for msg_control and msg_controllen on Solaris)
+     AC_DEFINE(__EXTENSIONS__,         1, Needed to get declarations for msg_control and msg_controllen on Solaris)
+     ;;
+esac
 
 LIBNICE_CFLAGS="-Wall"
 dnl if asked for, add -Werror if supported