The purpose of the lts6 (Long Term Stable 6.x) overlay is to provide portage ebuilds based on Enterprise Linux 6.x source RPMs. The goal is to develop a Gentoo-style installation that has long term stability and support. As it stands now, Many of these ebuilds are significant downgrades, and would tend to destabilize a typical Gentoo installation unless applied selectively. A Stage 3+ base release will need to be developed for most of these ebuilds to make sense.