Easily Use GMP in Xcode with GMPInt

When trying to work through a few of the Project Euler problems I kept running into an issue when trying to calculating big numbers accurately. Enter GMPInt, a handy Objective-C wrapper for GMP, the GNU Multiple Precision library. Just install GMP, link to the libgmp.dylib library in your Xcode project, drop the GMPInt header and implementation files into your project and your ready to go.