These ebuilds come from http://dev.openbossa.org/trac/mamona/wiki/MamonaGentooOverlay.
If you have some problems, go to the official site first.
cdebootstrap : Bootstrap a Debian system ( http://packages.qa.debian.org/c/cdebootstrap.html )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a mamona
For Paludis use this rsync : rsync://gentoo.zugaina.org/mamona-portage
If you have a problem : ycarus(-at-)zugaina.org