From 0bd46e82f1457c3a55b635ced540e59c912bf330 Mon Sep 17 00:00:00 2001
From: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Date: Mon, 25 Oct 2010 22:44:31 +0200
Subject: Build and source kernel directories

Fall back to the build directory if the source directory is not specified.
Check that it looks like as a source directory.
---
 configure.ac | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 0bff332..38164cf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,7 +19,7 @@ AC_ARG_WITH([kbuild],
             [KBUILDDIR="$withval";])
 AC_ARG_WITH([ksource],
             AS_HELP_STRING([--with-ksource=PATH],
-                           [Path to kernel source directory]),
+                           [Path to kernel source directory, if not the same as the kernel build directory]),
             [KSOURCEDIR="$withval";])
 AM_CONDITIONAL(WITH_KBUILDDIR, test "$KBUILDDIR" != "")
 AC_SUBST(KBUILDDIR)
@@ -34,9 +34,15 @@ fi
 
 if test -n "$KSOURCEDIR"; then
 	ksourcedir="$KSOURCEDIR"
+elif test -e "$kbuilddir/include/linux/netfilter/nfnetlink.h"; then
+	ksourcedir="$kbuilddir"
 else
 	ksourcedir="/lib/modules/$(uname -r)/source"
 fi
+if test ! -e "$ksourcedir/include/linux/netfilter/nfnetlink.h"
+then
+	AC_MSG_ERROR([Invalid kernel source directory $ksourcedir])
+fi
 
 if test ! -e "$kbuilddir/.config"
 then
-- 
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