> On Sep 22, 2016, at 07:19, Adam Dershowitz <de...@alum.mit.edu> wrote:
>> On Sep 22, 2016, at 4:49 AM, Jeremy Huddleston Sequoia 
>> <jerem...@macports.org> wrote:
>>> On Sep 21, 2016, at 12:45, Adam Dershowitz <de...@alum.mit.edu> wrote:
>>> It does:
>>> $ xcode-select -p
>>> /Applications/Xcode.app/Contents/Developer
>>> For me some updates in Macports, including some builds, seem to work OK, 
>>> and others, such as cmake, are giving an error:
>>> https://trac.macports.org/ticket/52258
>>> I’m not sure if I then need to completely switch to Xcode 7?  Or if I can 
>>> just install the command line tools for 10.11 Xcode 7.3.1?  If I do that, 
>>> where do they install, so that I can point xcode-select to the proper path?
>> If you don't have the CLTools installed, you wouldn't be able to install 
>> most of MacPorts.  I'm pretty sure you likely have them installed.
>> Dropping back down to Xcode 7 would mean that Xcode.app would contain the 
>> 10.11 SDK and would workaround your issue, but the issue is that the port 
>> isn't honoring your SDK (and maybe deployment target) selections (which 
>> default to / and host os version respectively).
> Something is still not clear to me.  I had Xcode 7 installed.  I was under 
> the impression that it included the SDK internally, so I don’t think that I 
> had separately installed the CLTools (although I’m not positive).  

Do you have /usr/include on your system?  If you do, you installed the CLTools.

> And, I have used macports for many years without a problem (over many 
> versions of Xcode).  When Xcode 8 was released I installed it, but didn’t 
> install CLTools either.
> What still isn’t clear to me is if cmake and openmodelica (which does have 
> the same problem as cmake, but it also depends on cmake so I tried to build 
> that with the working cmake) should work with my current configuration?  Do 
> they each have a bug?  Should just installing 10.11 CLTools allow them to 
> build?

It's possibly a bug in cmake and openmodelica ports (they're using the SDK 
inside of Xcode.app even though MacPorts is configured to use /).

It's definitely a bug in cmake and openmodelica upstream.  They're failing to 
build properly for the older deployment targets when using newer SDKs.

> Perhaps the answer, that I was missing, is that to use Xcode 8, on 10.11, the 
> user must explicitly install CLTools, but that would not be the case to run 
> Xcode 7 on 10.11 or Xcode 8 on 10.12?

Depends on your perspective.  We'd like to be in the world where you don't need 
to install the system headers, but 90% of OSS software fails when the SDK is 
newer than the base system because most OSS assumes that the SDK matches the 
minimum deployment target.

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