RE: [bug #60575] Permission denied on macOS Big Sur

[Marius Greuel]

> If I use the Avrdude version that's bundled with Arduino IDE
> (https://github.com/facchinm/avrdude) it works fine, but if I build my own
> Avrdude version from this repo I get the same error as Victor get.

Have you tried to build with libhidapi?

The autoconf script just grabs what is available, but it is not always a sane 
choice. There is hidapi, hidapi-libusb, and hidapi-hidraw, and libusb-1.0 
support as a fallback. I suspect that plain HID access via hidapi requires the 
least permissions.