pantalaimon : A Matrix proxy daemon that adds E2E encryption capabilities ( https://github.com/matrix-org/pantalaimon )
purple-carbons : Message Carbons plugin for libpurple ( https://github.com/gkdr/carbons )
purple-lurch : Plugin for libpurple implementing OMEMO ( https://github.com/gkdr/lurch )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a akater
For Paludis use this rsync : rsync://gentoo.zugaina.org/akater-portage
If you have a problem : ycarus(-at-)zugaina.org