libsdl2 built fails when updating ffmpeg

[tome at qx.net]

>
> 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