sane-backends: make libusb optional, add optional jpeg, tiff, avahi and snmp deps

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/sane-backends/Config.in

@@ -1,6 +1,5 @@
 config BR2_PACKAGE_SANE_BACKENDS
 	bool "sane-backends"
-	select BR2_PACKAGE_LIBUSB
 	help
 	  SANE - Scanner Access Now Easy
 

package/sane-backends/sane-backends.mk

@@ -7,7 +7,30 @@ SANE_BACKENDS_VERSION = 1.0.22
 SANE_BACKENDS_SOURCE = sane-backends-$(SANE_BACKENDS_VERSION).tar.gz
 SANE_BACKENDS_SITE = ftp://ftp2.sane-project.org/pub/sane/sane-backends-$(SANE_BACKENDS_VERSION)
 
+ifeq ($(BR2_PACKAGE_LIBUSB),y)
 SANE_BACKENDS_DEPENDENCIES += libusb
 SANE_BACKENDS_CONF_OPT += --enable-libusb_1_0
+else
+SANE_BACKENDS_CONF_OPT += --disable-libusb
+endif
+
+ifeq ($(BR2_PACKAGE_JPEG),y)
+SANE_BACKENDS_DEPENDENCIES += jpeg
+endif
+
+ifeq ($(BR2_PACKAGE_TIFF),y)
+SANE_BACKENDS_DEPENDENCIES += tiff
+endif
+
+ifeq ($(BR2_PACKAGE_AVAHI)$(BR2_PACKAGE_DBUS)$(BR2_PACKAGE_LIBGLIB2),yyy)
+SANE_BACKENDS_DEPENDENCIES += avahi
+SANE_BACKENDS_CONF_OPT += --enable-avahi
+endif
+
+ifeq ($(BR2_PACKAGE_NETSNMP),y)
+SANE_BACKENDS_DEPENDENCIES += netsnmp
+else
+SANE_BACKENDS_CONF_OPT += --without-snmp
+endif
 
 $(eval $(call AUTOTARGETS))