Build seems to complete successfully on OSX(10.11.6) with only some small issues (AvfMedia.dylib fails) however attempting to run the produced binary produces the following:
# ./Engine/Binaries/Mac/UE4Editor.app/Contents/MacOS/UE4Editor
dyld: Symbol not found: _BlueprintCompileAndLoadTimerData
Referenced from: ~/git/GameEngines/UnrealEngine/./Engine/Binaries/Mac/UE4Editor.app/Contents/MacOS/UE4Editor
Expected in: flat namespace
in ~/git/GameEngines/UnrealEngine/./Engine/Binaries/Mac/UE4Editor.app/Contents/MacOS/UE4Editor
[1] 23306 trace trap ./Engine/Binaries/Mac/UE4Editor.app/Contents/MacOS/UE4Editor