From a hardware perspective, any Mac that can run the latest Mac OS X works just fine.
On the software side, we will need the latest version of Mac OS X and all the latest updates need to be installed. The minimum at the time of writing this book is OS X 10.8 Mountain Lion.
For the platforms we are going to target, we need at least a device with iOS 5.0 and Xcode 4.0 or higher. The latest version of Sparrow uses OpenGL ES 2.0 internally, which is only supported by iPhone 3GS or newer devices.