@ iptables top directory
grep -r @PACKAGE_VERSION@ original/
-sed -i -e 's/@PACKAGE_VERSION@/1.4.18/' original/man8/iptables.8
-sed -i -e 's/@PACKAGE_VERSION@/1.4.18/' original/man8/ip6tables.8
+sed -i -e 's/@PACKAGE_AND_VERSION@/1.4.21/' original/man8/iptables.8
+patch -p3 < patch.original
git add -u
git add original