сканер canoscan 4400f

на сайте sane написано:
CanoScan 4400F USB 0x04a9/0x2228 Unsupported GL841 based, to be added to genesys backend

скачал genesys backend, там нашёл genesys_gl841.o, соответственно я так понимаю поддерживать должно

пишу
sane-find-scanner -v
.
.
.
libusb not available
# No USB scanners found. If you expected something different, make sure that
# you have loaded a kernel driver for your USB host controller and have setup
# the USB system correctly. See man sane-usb for details.
# SANE has been built without libusb support. This may be a reason
# for not detecting USB scanners. Read README for more details.

чё вобще делать?