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``glSDL is an implementation of the SDL API on top of OpenGL. This
  version is a proof-of-concept hack, and is implemented as a
  "wrapper" around SDL. However, the final version will be a real
  rendering backend, which will make it possible for most SDL
  applications to use hardware acceleration for all blits to the
  screen.''

Basically what it means, as far as I understand it, is that you write
your app as normal SDL, but can optionally link with glSDL (it's a
link time change, not runtime) to take advantage of 3D acceleration.

Note: I have not tried it myself.
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Hollerith, v.:
	What thou doest when thy phone is on the fritzeth.