buildroot/package/sane-backends/Config.in

config BR2_PACKAGE_SANE_BACKENDS
	bool "sane-backends"
	help
	  SANE - Scanner Access Now Easy

	  http://www.sane-project.org

	  Backends are included automatically based on the libraries that have
	  been selected: libusb, jpeg, tiff, avahi (with dbus and libglib2),
	  and netsnmp.