grafx2 : A pixelart-oriented painting program ( http://pulkomandy.tk/projects/GrafX2/downloads )
krita-bin : Free digital painting application. Digital Painting, Creative Freedom! ( https://www.kde.org/applications/graphics/krita/ https://krita.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a riru
For Paludis use this rsync : rsync://gentoo.zugaina.org/riru-portage
If you have a problem : ycarus(-at-)zugaina.org