JumSDL
This is a project that provides Objective-C bindings for the SDL library (http://www.libsdl.org/). The struct SDL_Surface, for instance, is embodied by the object JumSurface. Note that currently, JumSDL is very limited in function.
To compile, download and open the Xcode project, and build the framework. If you do not wish for Xcode to automatically place the framework in your /Library/Frameworks/ folder, remove the "Run Script" build phase in the Build Phases settings pane.