--- configure.ac.orig	Mon Feb 27 13:03:16 2006
+++ configure.ac	Mon Apr 24 23:18:56 2006
@@ -78,10 +78,6 @@
 # check for getaddrinfo
 AC_CHECK_FUNCS(getaddrinfo)
 
-# check for a usable tree.h
-AC_CHECK_HEADER(sys/tree.h,
-   AC_DEFINE(HAVE_SYS_TREE_H))
-
 # check whether we have posix stdint.h or at least inttypes.h
 AC_CHECK_HEADER(stdint.h,
    AC_DEFINE(HAVE_STDINT_H))
@@ -126,6 +122,8 @@
    AC_DEFINE_UNQUOTED(QUADXFMT, ${ac_cv_quad_fmt}"x")
 fi
 
+AC_EGREP_HEADER(ifi_link_state, net/if.h,
+	AC_DEFINE(HAVE_MIB_LINKSTATE))
 
 AC_CONFIG_FILES([
 	Makefile:config/Makefile.pre:Makefile.in