It will run in XWindows, although for the best results run in Console (as with ALL emulators!), this also has the advantage of running in fullscreen and at a higher resolution with no detrimental effect on performance. Well, ric_rpi has taken on the challenge of making a usable/playable N64 emulator and has comprehensively succeeded! It is still in an ‘Alpha’ stage but if you want to test it for yourself the process isn't onerous as the latest version will auto compile and build not just the emulator core, but all the required plugins. As I have written on previous occasions N64 emulation is probably the zenith of what may be possible on the Raspberry Pi.