These ebuilds come from https://github.com/Neuvoo/overlay.
If you have some problems, go to the official site first.
xorg-drivers : Meta package containing deps on all xorg drivers ( http://www.gentoo.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a neuvoo
For Paludis use this rsync : rsync://gentoo.zugaina.org/neuvoo-portage
If you have a problem : ycarus(-at-)zugaina.org