As the OpenWRT buildsystem already passes the right compile flags, we can skip the autodetection.
-diff -up miniupnpd-1.8.20140906/netfilter/Makefile.orig miniupnpd-1.8.20140906/netfilter/Makefile
---- miniupnpd-1.8.20140906/netfilter/Makefile.orig 2014-09-28 16:39:56.652296642 +0200
-+++ miniupnpd-1.8.20140906/netfilter/Makefile 2013-12-13 14:12:11.000000000 +0100
-@@ -38,6 +38,4 @@ endif
+--- a/netfilter/Makefile
++++ b/netfilter/Makefile
+@@ -38,8 +38,6 @@ endif
endif
endif
all: iptcrdr.o testiptcrdr iptpinhole.o \
testiptcrdr_peer testiptcrdr_dscp test_nfct_get
# testiptpinhole
-diff -up miniupnpd-1.8.20140906/Makefile.linux.orig miniupnpd-1.8.20140906/Makefile.linux
---- miniupnpd-1.8.20140906/Makefile.linux.orig 2014-09-28 16:46:06.781835136 +0200
-+++ miniupnpd-1.8.20140906/Makefile.linux 2014-09-28 16:46:14.388907413 +0200
-@@ -70,7 +70,6 @@ CPPFLAGS += -DIPTABLES_143
+--- a/Makefile.linux
++++ b/Makefile.linux
+@@ -73,7 +73,6 @@ CPPFLAGS += -DIPTABLES_143
endif
CFLAGS += $(shell $(PKG_CONFIG) --cflags libiptc)