Chenvr is a Gentoo-dedicated shell script that aims to provide an help in creating chrooted
Gentoo environment. It works on x86/x86_64 machines. It lets the user tweaking pre/in/post chroot via customizable scripts.
(and yes its name is a stupid french word-trick made with "CHrooted ENViRonment" :p)
(app-admin tree should be the right place, in your local overlay)