From a2996926e303e84436a89dc42fe65d32b5ab8eb5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Guido=20G=C3=BCnther?= <agx@sigxcpu.org>
Date: Sat, 14 Apr 2012 19:18:03 +0200
Subject: [PATCH] Fix macvtap detection by also checking for IFLA_VF_MAX

since this isn't available on older kernels such as Debian Squeeze's
2.6.32. This make --with-macvtap=check work as expected.
---
 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 3f5b3ffecb..53c9b34ee6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2534,7 +2534,8 @@ AC_MSG_CHECKING([whether to compile with macvtap support])
 if test "$with_macvtap" != "no" ; then
     AC_TRY_COMPILE([ #include <sys/socket.h>
                      #include <linux/rtnetlink.h> ],
-                   [ int x = MACVLAN_MODE_BRIDGE; ],
+                   [ int x = MACVLAN_MODE_BRIDGE;
+                     int y = IFLA_VF_MAX; ],
                    [ with_macvtap=yes ],
                    [ if test "$with_macvtap" = "yes" ; then
                          AC_MSG_ERROR([Installed linux headers don't show support for macvtap device.])