error: 'noreturn' attribute does not appear on the first declaration

Testing 4.5.0 alpha (2025-03-18 r87991) on On MacOS 15.3.2 (xcode 16),
I get an error when building e.g. 'stringi'

    /Library/Frameworks/R.framework/Resources/include/R_ext/Error.h:58:3:
error: 'noreturn' attribute does not appear on the first declaration
       [[noreturn]] void Rf_error(const char *, ...) R_PRINTF_FORMAT(1, 2);