You can try to downgrade your Xcode command line tools to 11.x, for example 
using this:

https://download.developer.apple.com/Developer_Tools/Command_Line_Tools_for_Xcode_11.5/Command_Line_Tools_for_Xcode_11.5.dmg



On Monday, September 21, 2020 at 9:14:11 AM UTC-7 [email protected] 
wrote:

> Ok, thanks for letting me know. Does that mean I can now not work on 
> tickets that are based on the latest develop branch?
>
> Anne
>
> On Monday, September 21, 2020 at 8:58:18 AM UTC-7 Matthias Koeppe wrote:
>
>> Hi Anne,
>> This is from the new Xcode 12 that probably came with a system update.
>> https://trac.sagemath.org/ticket/30494 tracks the progress of fixing 
>> Sage to support the new Xcode version.
>> Matthias
>>
>>
>> On Monday, September 21, 2020 at 8:51:35 AM UTC-7 [email protected] 
>> wrote:
>>
>>>
>>> Dear All,
>>>
>>> I am having trouble again to build the latest develop branch on MacOS 
>>> 10.15.6. The log files can be found at 
>>>
>>> https://www.math.ucdavis.edu/~anne/config.log
>>> https://www.math.ucdavis.edu/~anne/gf2x-1.3.0.log
>>>
>>> Best wishes,
>>>
>>> Anne
>>>
>>>
>>>

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