+CDEFS = -DF_CPU=$(F_CPU)UL
+CDEFS += -DDESCRIPTION=$(DESCRIPTION)
+CDEFS += -DVENDOR_ID=$(VENDOR_ID)
+CDEFS += -DPRODUCT_ID=$(PRODUCT_ID)
+CDEFS += -DMANUFACTURER=$(MANUFACTURER)
+CDEFS += -DPRODUCT=$(PRODUCT)
+ifdef MOUSE_DELAY_TIME
+CDEFS += -DMOUSE_DELAY_TIME=$(MOUSE_DELAY_TIME)
+endif