These ebuilds come from http://www.calculate-linux.org.
If you have some problems, go to the official site first.
gnome-common : Common files for development of Gnome packages ( http://git.gnome.org/browse/gnome-common )
gnome-keyring : Password and keyring managing daemon ( http://live.gnome.org/GnomeKeyring )
libgnome-keyring : Compatibility library for accessing secrets ( http://live.gnome.org/GnomeKeyring )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a calculate
For Paludis use this rsync : rsync://gentoo.zugaina.org/calculate-portage
If you have a problem : ycarus(-at-)zugaina.org