Sure… The files unpacked from audacity0master.zip, “audacity-master/mac/Build.txt” in the second paragraph looks like this:
“In the instructions below, Xcode 4.3.3 (for the 10.6 SDK) and
Xcode 5.1.1 will be used. Xcode 6.1.1, 6.3, 6.4.1, and 7.1
have been verified to work as well.”
Whereas the same file, at the link you posted here:
https://github.com/audacity/audacity/blob/master/mac/Build.txt
Here’s what the second paragraph looks like:
“In the instructions below, Xcode 4.3.3 (for the 10.6 SDK) and
Xcode 5.1.1 will be used. Xcode 6.1.1, 6.3, 6.4.1, and 7.1
have also been verified to work. Xcode 7.2 and later require a
custom build setting to accept the 10.6 SDK, or to edit
src\MemoryX.h in the Audacity code. See this topic:
https://forum.audacityteam.org/t/is-there-updated-build-instructions-for-compiling-audacity/42210/4 .”
So… the online file you posted appears new, and has the details that were the crux of my problem, whereas the the bulid.txt file that comes with the source code is missing that bit. Perhaps the souce code version of the file should be updated.