1) First thing you need to do is download the OS X development libraries from the SDL website. 2) Next open the dmg and copy the SDL2.framework to /Library/Frameworks. To go directly to a path in finder, press command+shift+g. 3) The framework may need to be resigned. To sign the framework, open up a terminal to:

/Library/Frameworks/SDL2.framework/

and sign the framework using the command:

codesign -f -s - SDL2

4) Now that you've installed the development libraries, it's time to start up your IDE/compiler.