These ebuilds come from http://git.overlays.gentoo.org/gitweb/?p=dev/anant/plan9.git;a=summary.
If you have some problems, go to the official site first.
plan9-libs.eclass : The ${PN} library in Plan9 from user space ( http://swtch.com/plan9port/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a plan9
For Paludis use this rsync : rsync://gentoo.zugaina.org/plan9-portage
If you have a problem : ycarus(-at-)zugaina.org