From 4309f0c390af2dd6013c853f128295205faca4c3 Mon Sep 17 00:00:00 2001
From: Sebastien Estienne <sebastien.estienne@gmail.com>
Date: Wed, 12 Oct 2005 22:52:51 +0000
Subject: [PATCH]  * add autoconf support for checking ip_mreqn

git-svn-id: file:///home/lennart/svn/public/avahi/trunk@749 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe
---
 configure.ac | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/configure.ac b/configure.ac
index ba369a1..9627ab5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -86,6 +86,9 @@ case "$host" in
     ;;
 esac
 
+#
+# Check for netlink.h
+#
 AC_CHECK_HEADER(linux/netlink.h, 
 HAVE_NETLINK=yes
 AC_DEFINE([HAVE_NETLINK],[],[Support for Linux netlink])
@@ -97,6 +100,34 @@ AC_DEFINE([HAVE_NETLINK],[],[Support for Linux netlink])
 AM_CONDITIONAL(HAVE_NETLINK, [ test x"$HAVE_NETLINK" = xyes ])
 
 #
+# Check for struct ip_mreqn
+#
+AC_MSG_CHECKING(for struct ip_mreqn)
+AC_TRY_COMPILE([#include <netinet/in.h>], [
+	struct ip_mreqn mreq;
+	mreq.imr_address.s_addr = 0;
+], [
+	# Yes, we have it...
+	AC_MSG_RESULT(yes)
+	AC_DEFINE([HAVE_STRUCT_IP_MREQN],[],[Support for struct ip_mreqn])
+], [
+	# We'll just have to try and use struct ip_mreq
+	AC_MSG_RESULT(no)
+	AC_MSG_CHECKING(for struct ip_mreq)
+	AC_TRY_COMPILE([#include <netinet/in.h>], [
+		struct ip_mreq mreq;
+		mreq.imr_interface.s_addr = 0;
+	], [
+		# Yes, we have it...
+		AC_MSG_RESULT(yes)
+		AC_DEFINE([HAVE_STRUCT_IP_MREQ],[],[Support for struct ip_mreq])
+	], [
+		# No multicast support
+			AC_MSG_RESULT(no)
+	])
+])
+
+#
 # Detecting the linux distribution for specific things like init scripts.
 #
 AC_ARG_WITH(distro, AS_HELP_STRING([--with-distro=DISTRO],[Specify the Linux distribution to target: One of debian, gentoo, archlinux or none]))
-- 
2.7.4