Did a retroarch version still develop and run on clockwork pi ? The Linux system comes with all the drivers also for a fully support of the gpu ?
The Clockwork Pi, in essence, is a motherboard with an ARM processor that comes with a Debian-based OS. This makes it similar to the Raspberry Pi at a technical standpoint, so just anything that will work with the RPi will work with the GameShell. Retroarch has many versions for boards like the Clockwork Pi and has an apt repo, so if anything you can use that to get it working.
is possible to run SDL?
Yes, it is. Two good wrappers for this would be Python’s Pygame or Lua’s LÖVE.
What about Ruby ?
This looks like a good option: https://github.com/gosu/gosu