I just downloaded Grapefruit Juce for Mac (I’m using version OS X 10.11.4 El Capitan with XCode 7.3).
I created a basic project choosing GUI application preset, but I get the following error in Projucer when compilation seems to be almost over:
JIT Process Crashed!:
Program used external function
"MIDIGetNumberOfSources" which could not be resolved!
I tried it in XCode and it works.