The _sdl is just part of the filename. You have to start it from xterm, by typing in the line suggested above.

I'm in the process of integrating this with the Hildon Games Wrapper so that it has an interface just like many of the standard games.

I hope to have some installer packages that people can try out in a week, maybe two.

Incidentally, for those of you who have usb gamepads, and have gotten USB host mode working, gambatte_sdl (posted above) and MaemoBoy (my project) both support the gamepad.