First, install the correct version of libusb:
sudo apt-get install libusb-1.0.0-dev
Second, run make.
The executable needs root access, so
sudo ./cryotherm
A file called monitorboard.dat
will be continuously updated with the most recent readings (appended at the end).
A second file called monitorboard-oneline.dat
will have only the most recent readings (single line).
The code in libusb/ is from the SDK, except with the location of libusb.h corrected.