Just an FYI, as of 5/20/80, mupen64plus is not yet in portage or any public overlay. However, there are some nice ebuilds available on gentoo's bugzilla here:

http://bugs.gentoo.org/show_bug.cgi?id=215426 (Click the attachment links)

The live svn ebuild works great for me and I know several others. I'd highly recommend it!



Read this if you've never used a custom overlay:
http://gentoo-wiki.com/HOWTO_Install..._Party_Ebuilds
Thanks for this terrific emulator all those who contribute!