configure --extra-cflags and --extra-ldflags values not propagating to meson?

Am I using --extra-cflags and --extra-ldflags wrong in the configure call? I'd like to source build several pre-reqs specific to supporting the qemu source build. I'd specifically not like to install neither the qemu or re-req builds at the system level. Normally I'd expect the --extra-cflags an

Possible to make Bluetooth adapter appear in guest system where host does not actually have Bluetooth?

I'm using OSX-KVM but having trouble with AirPlay. I suspect the issue is that the guest OS has no Bluetooth adapter, even though AirPlay itself does not use Bluetooth to communicate. My Host OS does not actually have a BT adapter, but I'm wondering if there is any way for qemu to simulate one