-LUFA_OPTS = USE_NONSTANDARD_DESCRIPTOR_NAMES
-LUFA_OPTS += USB_DEVICE_ONLY
-LUFA_OPTS += FIXED_CONTROL_ENDPOINT_SIZE=8
-LUFA_OPTS += USE_SINGLE_DEVICE_CONFIGURATION
-LUFA_OPTS += USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"
+LUFA_OPTS = -D USE_NONSTANDARD_DESCRIPTOR_NAMES
+LUFA_OPTS += -D USB_DEVICE_ONLY
+LUFA_OPTS += -D FIXED_CONTROL_ENDPOINT_SIZE=8
+LUFA_OPTS += -D TOTAL_NUM_CONFIGURATIONS=1
+LUFA_OPTS += -D USE_FLASH_DESCRIPTORS
+LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"