Unable to use the "set" module with ip6tables in RHEL6

Issue

• The set match module missing with ip6tables in RHEL6.5 and earlier
• The following error is seen when trying to load an inet6 family set with ip6tables:

# ip6tables -A INPUT -m udp -p udp -m set --set dns_ipv6 src --sport 53 -j ACCEPT
ip6tables v1.4.7: Couldn't load match `set':/lib64/xtables/libip6t_set.so: cannot open shared object file: No such file or directory