libsdl2 built fails when updating ffmpeg

[Ryan Schmidt]

> On Mar 23, 2017, at 09:43, tome at QX.Net wrote:
> 
>> 
>> On Mar 23, 2017, at 09:33, tome at QX.Net wrote:
>> 
>>>> What version of Xcode and the command line tools do you have installed?
>>>> If
>>>> it's not the very latest for 10.7 (Xcode 4.6.3 and Command Line Tools
>>>> (OS
>>>> X Lion) for Xcode - April 2013) try updating to that.
>>> 
>>> Thank you.  I am downloading xcode 4.6.3.
>> 
>> Just out of curiosity, what version did you have before?
>> 
>>> I have not been able to
>>> determine my version of command line tools. Where on my mac do I check
>>> the
>>> version of command line tools?
>> 
>> I don't actually know. But you should use the version of the CLT that
>> matches the version of Xcode. So if you're upgrading to Xcode 4.6.3 now,
>> you should upgrade to the corresponding CLT (April 2013) at the same time.
>> 
>>> Are there things I should backup before
>>> starting these upgrades?
>> 
>> 
>> Probably no need. In the unlikely event that you have problems with the
>> new Xcode and CLT and want to go back to the old versions, you can follow
>> Apple's instructions in the read me file for uninstalling them and then
>> install the old versions again.
> 
> My present xcode is 4.2.  Will download CLT April 2013 when xcode download
> is complete, 28 minutes. Tks

Don't forget to "sudo port clean libsdl2" before trying again.

According to http://www.openradar.me/12772011 it looks like indeed NSWindowDidChangeBackingPropertiesNotification and NSBackingPropertyOldScaleFactorKey were added in OS X 10.7.3, the release date for which was February 1, 2012. Xcode 4.2 was released October 12, 2011 so it would not know about those. Xcode 4.3 was released February 16, 2012 and would presumably contain these constants.