Patch from steelman. fixes bug 437.

package/iptables/iptables.mk

@@ -20,7 +20,7 @@ $(IPTABLES_BUILD_DIR)/.configured: $(IPTABLES_BUILD_DIR)/.unpacked
 	toolchain/patch-kernel.sh $(IPTABLES_BUILD_DIR) package/iptables/ iptables\*.patch
 	#
 	$(SED) "s;\[ -f /usr/include/netinet/ip6.h \];grep -q '__UCLIBC_HAS_IPV6__ 1' \
-		$(BUILD_DIR)/uClibc/include/bits/uClibc_config.h;" $(IPTABLES_BUILD_DIR)/Makefile
+		$(STAGING_DIR)/include/bits/uClibc_config.h;" $(IPTABLES_BUILD_DIR)/Makefile
 	touch  $(IPTABLES_BUILD_DIR)/.configured
 
 $(IPTABLES_BUILD_DIR)/iptables: $(IPTABLES_BUILD_DIR)/.configured