These ebuilds come from https://github.com/tokiclover/bar-overlay.
If you have some problems, go to the official site first.
xf86-video-nouveau : Accelerated Open Source driver for nVidia cards ( http://nouveau.freedesktop.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a bar-overlay
For Paludis use this rsync : rsync://gentoo.zugaina.org/bar-overlay-portage
If you have a problem : ycarus(-at-)zugaina.org