well the 'Amiga' SDL package is a botched product
it doesn't work well with any compiler that I own
it isn't fast (no matter what CPU you have)
it doesn't work with P96 (which means it won't work with OS4)
the OpenGL support is a failure (they should have gone with minigl)
I would suggest you go with the WarpSDL package instead
it's faster, leaner and in every way better.
(I hope the SDK is released soon)