These ebuilds come from http://luke.dashjr.org/programs/gentoo-n900.
If you have some problems, go to the official site first.
telepathy-ring : Telepathy connection manager for cellular calls and SMSs, using oFono as backend ( https://meego.gitorious.org/meego-cellular )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a n900
For Paludis use this rsync : rsync://gentoo.zugaina.org/n900-portage
If you have a problem : ycarus(-at-)zugaina.org