sdriq on mac

Hi, I have tried to use gqrx with an RFSPACE sdriq using the gr-osmosdr. The experiment failed on both 10.7.5 and 10.9.5 despite following the ftdi site instructions for either OS. I have installed all s/w via mac ports. D2XX is installed in /usr/local/lib and, according to the suggestion of a person from Ettus, tried to set DYLD_INSERT_LIBRARIES=/usr/local/lib/libftd2xx.1.2.2.dylib gxrz. All to no avail. When I run gqrx I get: and if I edit the settings, I get: But there is not /dev/ttyUSB0 nor do I know why a device is required if there is direct access (I suppose via libusb?). System profiler clearly show the device: Could anybody tell me what is the prescribed way of achieving what I am trying, or a way of debugging what is wrong? Thank you, Alex