Created attachment 209310 [details] usb.cpp The attached usb.cpp fails (when the supported device is present) at libusb_claim_interface when libusb_set_auto_detach_kernel_driver is called before it. Removing libusb_set_auto_detach_kernel_driver makes libusb_claim_interface to succeed. I had to patch the port misc/openhantek with the workaround for this issue in order to make it to work.