The project on bitbucket contains the extension files in “Classes” folder. You can import those files in your project and use them as long as you have sparrow 2.x and box2d 2.0.x libraries in your project. In the example project I used http://cocoapods.org/ to manage those libraries, and you can find a commented usage example in the file Game.mm. It's important to consider that the box2d objects are created only when the display object (body or joint or world) is added to the display tree. Finally, remember to rename your source files where you import SXPhysics with .mm extension instead of .m .
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