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--- configure.in.orig 2006-06-19 08:08:48.000000000 +0000
+++ configure.in 2008-04-30 05:57:39.000000000 +0000
@@ -1405,6 +1405,26 @@
AC_CACHE_CHECK(type of rtentry structure,ac_cv_RTENTRY_TYPE,
[
+dnl 4.4 compatible but renamed on FreeBSD
+AC_TRY_COMPILE([
+#include <sys/types.h>
+#define KERNEL
+#define _KERNEL
+#include <sys/socket.h>
+#undef KERNEL
+#undef _KERNEL
+#include <net/route.h>
+],[
+
+#ifndef STRUCT_RTENTRY_HAS_RT_DST
+#define rt_dst rt_nodes->rn_key
+#endif
+
+ struct rtentry rt;
+ rt.rt_nodes[0].rn_bit = 1;
+ rt.rt_dst;
+ ], ac_cv_RTENTRY_TYPE="BSD-4.4")
+
# 4.4 compat
AC_TRY_COMPILE([
#ifdef HAVE_SYS_PARAM_H
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