Also see such errors for version 13.3: /Library/Developer/CommandLineTools/SDKs/MacOSX13.3.sdk/usr/include/c++/v1/cstddef:50:9: error: no member named 'nullptr_t' in the global namespace using ::nullptr_t; There is no such error for my project for version 13.1 So I think for now it's suggested to just downgrade