As of libusb 1.0.9, libusb supports Windows natively. We should remove calls to libusbemu and use the same calls as we do on linux / os x. BUILD_AUDIO is currently broken on Windows because libusbemu does not emulate all libusb functions. ( libusb_get_device an example of one ). See: http://www.libusb.org/wiki/windows_backend I am happy to build the libs and submit a PR - just wanted to see if there was any objections or reasons why this has not already been done. Theo