xf86-video-ati : ATI video driver patched for Mir display server ( http://www.x.org/wiki/ati/ )
xf86-video-intel : X.Org driver for Intel cards ( )
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 unity-gentoo
For Paludis use this rsync : rsync://gentoo.zugaina.org/unity-gentoo-portage
If you have a problem : ycarus(-at-)zugaina.org