prereq: FORCE
$(MAKE) -C linux/$(BOARD)-$(KERNEL) prereq
- $(MAKE) -C $(IMAGE_DIR) prereq
+ [ \! -f $(IMAGE_DIR)/Makefile ] || $(MAKE) -C $(IMAGE_DIR) prereq
sdk_install: FORCE
$(MAKE) -C sdk install
imagebuilder_install: image_install
$(MAKE) -C imagebuilder install
-%-prereq %-prepare %-download %-clean %-compile %-install %-refresh: FORCE
+%-prereq %-prepare %-download %-clean %-compile %-install %-refresh %-update: FORCE
$(MAKE) -C $* $(patsubst $*-%,%,$@)