On Oct 12, 2019, at 12:14, Andrew Hartung wrote:

> On Oct 12, 2019, at 10:10 AM, Ryan Schmidt wrote:

>> Clang 11 goes with Xcode 11 but you said you have Xcode 10. You should 
>> either upgrade to Xcode 11 to match your clang version (I don't recommend 
>> this due to the many problems we've seen with SDK paths) or you should 
>> downgrade your Clang version (that is to say, your command line tools 
>> version) to match your Xcode version.
> How do I do that?

You can download old versions of Xcode and the command line tools from:


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