> On Sep 22, 2016, at 7:25 AM, Ryan Schmidt <ryandes...@macports.org> wrote:
>> On Sep 22, 2016, at 3:44 AM, Jeremy Huddleston Sequoia 
>> <jerem...@macports.org> wrote:
>>> On Sep 21, 2016, at 12:15, Adam Dershowitz <de...@alum.mit.edu> wrote:
>>> That comment does not make it at all clear what those of us who updated to 
>>> Xcode 8 (but not beta!) but are still on OS X 10.11 are supposed to do. 
>> If you don't need the CLTools, do nothing.
>> If you need the CLTools, install the latest version (or likely just stick 
>> with the version that you have if you already have them).
>>> I have posted a ticket about building cmake that seems to be because it is 
>>> trying to use 10.12 SDK, but it is not clear how to work around that.
>> If a port is using an SDK and you haven't configure it to do so, that's a 
>> port bug.
>>> Perhaps the answer is to downgrade to Xcode 7, and stay away from 8?  (It 
>>> is a big download!)
>> Why?  Fix the bug in the port.
>>> Or, it might be that just the 10.11 command line tools is enough?
>> The 10.11 CLTools installs the 10.11 headers to /.  Your issue with cmake is 
>> likely that the port is (incorrectly) trying to use the 10.12 SDK and 
>> expecting it to match the base system somehow... ?
> cmake is a bug...

A user just added a comment to the cmake issue that indicates that it is 
actually an undeclared type in the Apple header file, and that a bug report has 
now been filed with Apple.  It also includes a work around:  

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