puppetlabs/puppetlabs-apache — pull request #76 by hunner (2012-08-16 00:49:08+00:00)
Title: Remove apache::mod::mem_cache from apache::mod::default

As per
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Migration_Planning_Guide/ch04s04.html
mem_cache is also no longer supported by redhat.