I tried building for Mac Mojave
Xcode 8.1 does not work with Mojave.
Building wxwidgets works.
Xcodebuild does not.
I tried using Xcode 10.13 after inserting the 10.7SDK, but xcodebuild fails.
See the instructions here: https://github.com/audacity/audacity/blob/master/mac/build.txt
I followed that.
But Xcode8.1 will not open, nor does xcodebuild work, in Mac Mojave.
So I used Xcode 10.13.
I inserted the 10.7sdk extracted from the Xcode4.?.?.app.
Xcodebuild didn’t work. Maybe it’s because I have a bunch of Homebrew stuff installed?
Unfortunately I don’t know a lot about building on Mac, other than that I managed to build Audacity on Mojave by carefully following those instructions.
What errors are you getting?