These ebuilds come from http://catmur.co.uk/gentoo/.
If you have some problems, go to the official site first.
cairo-ocaml : Objective Caml bindings for Cairo ( http://cairographics.org/cairo-ocaml )
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