MacOS Build : ALL_BUILD Xcode target does not build from a clean install (needs 'configure' target)

If you follow the instructions from the developer page and skip the command line build in favor of the Xcode build, the app will not build. It fails with this error:

clang: error: no such file or directory: '/MuseScore/build.xcode/all.h'

The ALL_BUILD target does work if I first build via the command-line.

I think the Xcode target is missing some setup. Alternatively, the developer page should be updated to say that you need to run the command-line steps prior to the Xcode build.