The Simple DirectMedia Layer (SDL for short) is a cross-platform library designed to make it easy to write multi-media software, such as games and emulators.The Simple DirectMedia Layer library source code is available from: http://www.libsdl.org/This library is distributed under the terms of the zlib license: http://zlib.net/zlib_license.htmlThis packages contains the SDL framework for OS X. Conforming with Apple guidelines, this framework contains both the SDL runtime component and development header files.To Install:Copy the SDL2.framework to /Library/FrameworksYou may alternatively install it in /Library/Frameworks if your access privileges are not high enough. Additional References: - Screencast tutorials for getting started with OpenSceneGraph/Mac OS X are available at:http://www.openscenegraph.org/projects/osg/wiki/Support/Tutorials/MacOSXTipsThough these are OpenSceneGraph centric, the same exact concepts apply to SDL, thus the videos are recommended for everybody getting started withdeveloping on Mac OS X. (You can skim over the PlugIns stuff since SDLdoesn't have any PlugIns to worry about.)