Backport: Patch from coderman: detect transparent proxy header correctly on some linux versions.

svn:r15727

ChangeLog

@@ -33,6 +33,9 @@ Changes in version 0.2.0.29 - 2008-06-xx
     - When opening /dev/null in finish_daemonize(), do not pass the
       O_CREAT flag.  Fortify was complaining, and correctly so.  Fixes
       bug 742; fix from Michael Scherer.  Bugfix on 0.0.2pre19.
+    - Correctly detect transparent proxy support on Linux hosts that
+      require in.h to be included before netfilter_ipv4.h.  Patch
+      from coderman.
 
 
 Changes in version 0.2.0.28-rc - 2008-06-13

configure.in

@@ -335,6 +335,9 @@ AC_CHECK_HEADERS(linux/netfilter_ipv4.h,
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
 #endif])
 
 if test x$transparent = xtrue ; then