Nice work. Does it use some kind of audio abstraction layer so ports to non Mac platforms might be easy?
g++ -O2 -march=native -mtune=native -D__LINUX_PULSE__ -D__LINUX_ALSA__ -D__UNIX_JACK__ \
lcc_rtaudio.cpp RtAudio.cpp -o lcc -pthread -ljack -lasound -lpulse-simple -lpulse
The above will give you a binary with the Jack, ALSA and PulseAudio backends baked in.