[Interest] Apple/iOS/XCode8 problems

[Jason H]

Recently, we did a release using 5.6.2 and it is crashing on all the phones. 
I'm trying to revert to 5.6.0, but in the time between the two, my mac installed XCode 8 and SDK 10.12.

When I try to build now, with QMAKE_MAC_SDK = macosx10.12 I get:
:-1: error: Current macosx10.12 SDK version (10.12) is too old. Please upgrade Xcode.

But 
$ ls /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/
MacOSX.sdk     	MacOSX10.12.sdk

It's all I have now. (Thanks Apple! >:-| )

How can I get out of this pickle? I need to use Qt 5.6.0 (last know good version) XCode 8 and 10.12 SDK (I can't downgrade!)