Updating tk +quartz failed on Snow Leopard

[Ryan Schmidt]

> On Aug 23, 2016, at 9:10 PM, Kevin Walzer <kw at codebykevin.com> wrote:
> 
> On 8/23/16 10:04 PM, Ryan Schmidt wrote:
>> 
>> This is weird because the backingScaleFactor method is supposed to return a double, not an id, and is part of the Retina display API introduced in Mac OS X 10.7. It is not in 10.6. The window should not be responding to the backingScaleFactor selector on 10.6, so that if statement should never have returned true and that code should never have been run.
> 
> While I'm not the author of that code, I did commit it, and you're right, it should not have run. What compiler is this error being triggered on?

Apple gcc-4.2.1, the default compiler on Snow Leopard with Xcode 3.2.6.