+ AC_MSG_CHECKING([if __vlan_put_tag has 3 parameters])
+ LB_LINUX_TRY_COMPILE([
+ #include <linux/if_vlan.h>
+ ],[
+ struct sk_buff *skb;
+ __vlan_put_tag(skb, 0, 0);
+ return 0;
+ ],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_3_PARAMS_FOR_VLAN_PUT_TAG, 1,
+ [__vlan_put_tag has 3 parameters])
+ ],[
+ AC_MSG_RESULT(no)
+ ])