libusb not working properly on 9.0/9.1

[Rocky Hotas <rockyhotas%firemail.cc@localhost>]

Hello!
I would like to run this executable

 <https://github.com/mvp/uhubctl/>

on NetBSD, but even on a supported hardware platform (Raspberry Pi 3
B+) it is unusable, due to libusb not properly working. I was using
libusb1-1.0.24 from pkgsrc 2020Q4.

As suggested here:

 <https://github.com/mvp/uhubctl/issues/306#issuecomment-761072149>

(bypassing pkgsrc) I cloned the repository of libusb and built from it.
After successfully completing the operations, the basic tools
examples/listdevs and example/testlibusb do not work.

This happens both with:

- NetBSD 9.1 on Raspberry Pi 3 B+ (evbarm);
- NetBSD 9.0 on a laptop (amd64).

What could it be the reason?

Rocky