Portfolio += SDL Games

Yes!

It doesn't even matter what games you make either I don't believe. I guess it would depend on what company you send your portfolio off to, for I can see certain game developing companies will be looking for specific game concepts, languages, API knowledge as others will just look to see if you can learn a library and utilize it. Nevertheless, making any games from any library, and throwing in your portfolio would be a plus anyways.

I say it's better to have a game in something, and turn that in than have nothing at all!

Specific tools--libraries, languages, whatever--matter less than the concepts you learn through them. Anything can help.

I think to make a game with a 3D engine but with SDL is more easy and I can complete a game in few time