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Here’s how to compile the Exodriver and libusb with debugging on. In the Exodriver source code’s labjackusb.c, find this line:

#define LJ_DEBUG false

and change it to:

#define LJ_DEBUG true

Then rerun make and “sudo make install” as the INSTALL file describes. For libusb, rerun configure with this flag:

./configure --enable-debug-log

and rerun make and “sudo make install”.

These libraries will now produce copious output that may help you debug your application.