XCode normally likes seeing things in frameworks, but you can also link against paths.
In the compile/link settings for your project, you can add paths to the headers, and paths to the libs (you will need those as well). Be aware that doing it this way will make it so that the app will only /launch/ on machines with a compatible version of SVN installed, so it isn't ideal for distribution.
It isn't too horribly difficult to create your own SVN.framework bundle with the libs and headers there, and then link against that and copy it into your app bundle for something you intend to distribute. In fact, someone might have already done it.