From 61fb537c6273c50deb7d33f8af246993eab4bc4d Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Mon, 12 Apr 1999 15:27:56 +0000
Subject: Use `struct ip_mreqn' instead of `struct ip_mreq' for multicast
 operations on 2.1/2.2 kernels. This allows passing of real interface indexes
 instead of referencing interfaces by their IP addresses which fails badly in
 presence of unnumbered interfaces.

Unfortunately, this structure is not visible with glibc 2.0 as it provides
its own networking headers :-(  Both libc5 and glibc 2.1 should be OK.
---
 aclocal.m4 | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'aclocal.m4')

diff --git a/aclocal.m4 b/aclocal.m4
index 651b0db..98a5ca8 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -116,3 +116,15 @@ case "$bird_cv_type_time_t" in
 	*)		AC_DEFINE(TIME_T_IS_SIGNED) ;;
 	esac
 ])
+
+AC_DEFUN(BIRD_CHECK_STRUCT_IP_MREQN,
+[AC_CACHE_CHECK([struct ip_mreqn], bird_cv_struct_ip_mreqn,[
+AC_TRY_COMPILE([#include <netinet/in.h>
+],[struct ip_mreqn x;
+],[bird_cv_struct_ip_mreqn=yes
+],[bird_cv_struct_ip_mreqn=no
+])])
+if test "$bird_cv_struct_ip_mreqn" = yes ; then
+	AC_DEFINE(HAVE_STRUCT_IP_MREQN)
+fi
+])
-- 
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