GXsnes9x
From GamecubeLinux Wiki
Snes9x (http://www.snes9x.com/) was ported to GC-Linux using LibGX by Scream|CT. The version available here has some extra command line flags by Stonebone to enable 4 players.
Source is available here: snes9x-1.43-gx.tar.gz (http://www.itstud.chalmers.se/~larssten/gc-linux/snes9x-1.43-gx.tar.gz)
Precompiled binaries here: gxsnes9x.tar.gz (http://www.itstud.chalmers.se/~larssten/gc-linux/gxsnes9x.tar.gz)
Run the binaries with the supplied snes.sh script to get useful button mappings for four controllers. The gxsnes9x_static is statically linked so that you do not need to have LibGX installed.

