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-rw-r--r--configure.ac5
1 files changed, 4 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index b7b69d1..a03401b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -212,9 +212,12 @@ if test -f $ksourcedir/include/linux/workqueue.h && \
$GREP -q 'system_power_efficient_wq' $ksourcedir/include/linux/workqueue.h; then
AC_MSG_RESULT(yes)
AC_SUBST(HAVE_SYSTEM_POWER_EFFICIENT_WQ, define)
-else
+elif test -f $ksourcedir/include/linux/workqueue.h && \
+ $GREP -q 'system_wq' $ksourcedir/include/linux/workqueue.h; then
AC_MSG_RESULT(no)
AC_SUBST(HAVE_SYSTEM_POWER_EFFICIENT_WQ, undef)
+else
+ AC_MSG_ERROR([Kernel source tree is too old, at least v2.36 is required])
fi
AC_MSG_CHECKING([kernel source for struct xt_action_param])