Errors when building from on macos (qt = 6.7, cmake = 3.29.2)

[DJVonrhein]

My error reads:

PokeFinder/Source/Core/Gen5/Keypresses.cpp:77:30: Error: no member named 'popcount' in namespace 'std'; did you mean '__popcount'?

It looks like a problem of c++11 being used instead of c++20, even though the CMakeLists.txt in Source/Core sets it to c++20 and requires it.

Setting the root CMakeLists.txt to c++20 causes other errors. Any advice?