Compilation error on Debian 11: error: use of undeclared identifier 'wl_proxy_marshal_flags'

According to this discussion in the forums
it seems the error is because Debian 11 comes with libwayland-1.18 but Qt requires libwayland 1.20.

Wouldn't it be better to detect it at configure time and print a relevant error message?

EDIT: It seems my case is different from the one in the forums. My case is caused by using host's wayland-scanner tool while cross-compiling, with the tool being different version from the one in the sysroot.