From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philip Prindeville <philipp@redfish-solutions.com>
Subject: Issues with 1.4.10 build of iptables/extensions
Date: Wed, 22 Feb 2012 15:05:59 -0700
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Seeing the following:

make[5]: Entering directory `/home/philipp/openwrt-alix/build_dir/linux-x86_alix2/iptables-1.4.10/extensions'
if test -n "   "; then install -pm0755  "/home/philipp/openwrt-alix/build_dir/linux-x86_alix2/iptables-1.4.10/ipkg-install/usr/lib/iptables/"; fi;
install: missing destination file operand after `/home/philipp/openwrt-alix/build_dir/linux-x86_alix2/iptables-1.4.10/ipkg-install/usr/lib/iptables/'
Try `install --help' for more information.
make[5]: *** [install] Error 1

The problem is here:

targets_install += ${pfx_solibs} ${pf4_solibs} ${pf6_solibs}
...
install: ${targets_install}
        @mkdir -p "${DESTDIR}${xtlibdir}";
        if test -n "${targets_install}"; then install -pm0755 $^ "${DESTDIR}${xtlibdir}/"; fi;

that should read:

install: ${targets_install}
        @mkdir -p "${DESTDIR}${xtlibdir}";
        if test -n "$(strip ${targets_install})"; then install -pm0755 $^ "${DESTDIR}${xtlibdir}/"; fi;