Comment # 1 on bug 1029838 from Stanislav Brabec

nut was not ported to libusb-1.0 yet.

As libusb-1.0 is not backwards compatible with libusb-0.1 - all function names
are different, etc. As the libusb-0.1 calls are spread across the whole
projects, porting would needs large amount of work.

libusb-0.1 has call and wait API (call read that waits for completing, call
write that waits for completing)

libusb-1.0 has event driver API (fill, submit, completed callback)

We already got rid libusb-0.1 long time ago. Now we have libusb-compat wrapper,
which contains 95% of libusb-0.1 features.

I am afraid that libusb-0.1 API is still widely used in third party enterprise
applications.