docker : Docker complements LXC with a high-level API which operates at the process level. ( http://www.docker.io/ )
virtualbox-modules : Kernel Modules for Virtualbox ( http://www.virtualbox.org/ )
xen : The Xen virtual machine monitor ( http://xen.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a dberkholz
For Paludis use this rsync : rsync://gentoo.zugaina.org/dberkholz-portage
If you have a problem : ycarus(-at-)zugaina.org