These ebuilds come from http://www.haskell.org/~gentoo/gentoo-haskell/.
If you have some problems, go to the official site first.
yi : The Haskell-Scriptable Editor ( http://haskell.org/haskellwiki/Yi )
yi-gtk : GTK backend for the Yi editor ( http://www.cse.unsw.edu.au/~dons/yi.html )
yi-vty : vty backend for the Yi editor ( http://www.cse.unsw.edu.au/~dons/yi.html )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a zugaina
For Paludis use this rsync : rsync://gentoo.zugaina.org/zugaina-portage
If you have a problem : ycarus(-at-)zugaina.org