[PATCH iptables 3/3] android: build: Blacklist TCPOPTSTRIP on systems that lack TCPOPT_*

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Bionic's <netinet/tcp.h> is missing constants needed to build this module,
so have autoconf check for this condition before trying to build it.

Signed-off-by: Kevin Cernekee <cernekee@xxxxxxxxx>
---
 configure.ac |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/configure.ac b/configure.ac
index 76d0b37..53a9ded 100644
--- a/configure.ac
+++ b/configure.ac
@@ -91,6 +91,14 @@ if test "$nfconntrack" -ne 1; then
 	echo "WARNING: libnetfilter_conntrack not found, connlabel match will not be built";
 fi;
 
+AC_CHECK_DECL([TCPOPT_WINDOW], [tcpopt_ok=1], [tcpopt_ok=0],
+	[[#include <netinet/tcp.h>]])
+
+if test "$tcpopt_ok" -ne 1; then
+	blacklist_modules="$blacklist_modules TCPOPTSTRIP";
+	echo "WARNING: TCPOPT_* constants not found, TCPOPTSTRIP target will not be built";
+fi;
+
 AC_SUBST([blacklist_modules])
 AC_CHECK_SIZEOF([struct ip6_hdr], [], [#include <netinet/ip6.h>])
 
-- 
1.7.9.5

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