It seems I'm in a bit of a pickle.
Vuforia does not run in the simulator. Fine, I have to run it on the iPhone directly.
Ok, but my only iPhone is a 5S, which is 64-bit.
When I select it as my target, Xcode won't build Vuforia, because it's missing arm64.
Does anyone know a way to get Xcode to build a 32-bit version for an iPhone 5S target?