iOSPorts.xcodeproj Makefile hard-coding /Application/Xcode

I have multiple version of Xcode installed, so most of them are not located at /Application/Xcode, but when the iOSPorts gets built, it uses the wrong Xcode.

Can you make a configurable option somewhere to fix this? Or can you tell me which Makefile to edit to change the location to point to the right Xcode?
