@cavearr, this is a question for you.

The general command line for the tinyprog progammer that apio uses is

tinyprog --pyserial -c ${SERIAL_PORT} --program $SOURCE

However there is a special hardcoded case for tinyprog on darwin which sets the command

tinyprog --libusb --program $SOURCE

Is this special case necessary? Can we merge the cases together into a single command line?