file-roller : Archive manager for GNOME ( https://wiki.gnome.org/Apps/FileRoller" particular archive format support, see ${HOMEPAGE )
gnome-autoar : Automatic archives creating and extracting library ( https://git.gnome.org/browse/gnome-autoar )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a gnome-next
For Paludis use this rsync : rsync://gentoo.zugaina.org/gnome-next-portage
If you have a problem : ycarus(-at-)zugaina.org