What version of Xcode and mac sdk that got along with unreal 4.6?

Hello mates, as the title stated, can you guy tell me which version of xcode and mac sdk to use so that i can compile my 4.6 project on my mac? So far, i have got a bunch of error when trying to build my project, some typical error are something like:

ApplePlatformFile.h: ‘IterateDirectory’ overrides a memeber function but is not marked ‘override’
ArchiveBase.h: ‘operator<<’ overrides a member function but is not marked ‘override’

I have build the same project around 1 year ago, and have encounter no such problem.
I am currently using OS X 10.11 and Xcode version 7.3, stuck with an unreal project version 4.6.1.

I also try to create another code project, and also got the same problem when i trying that project in xcode.
Please pardon for my bad English and thank you for reading my question. Have a good day mated.