I have not tried your path, but I have already installed the Java developer framework and macports libusb. I pointed to the libusb in /opt/local. With the configure edit and had editting the Makefile to use libusb in /opt/local I was able to upgrade the firmware on by DSO nano 1.0. I did configure. Removed the failed expansion of libusb. editted the makefile in src to use /opt/local/include and lib for libusb, and it works.