Command Line Tools warning

[Ryan Schmidt]

>> On Fri, 30 Oct 2015, Mathieu Deaudelin-Lemay wrote:
>> 
>>> Just for the record, if you are planning on staying on OS X 10.10 
>>> (Yosemite), do not upgrade to Xcode 7 as it does not include the SDK for 
>>> that OS (only 10.11).
>> 
>>> This shouldn't be a problem much of the time, but there are some ports 
>>> that will fail to build (e.g. wireshark), as they'll be looking for a 
>>> SDK matching your system version and will fail to find it.

Wireshark might be an exception, but I tried many ports with Xcode 7 on Yosemite and did not see any problems.