desmume : Nintendo DS emulator ( https://desmume.org/ https://github.com/TASVideos/desmume )
melonds : NintendoDS emulator, sorta. Also 1st quality melon. ( http://melonds.kuribo64.net https://github.com/Arisotura/melonDS )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a waffle-builds
For Paludis use this rsync : rsync://gentoo.zugaina.org/waffle-builds-portage
If you have a problem : ycarus(-at-)zugaina.org