-LUFA_OPTS = USB_DEVICE_ONLY\r
-LUFA_OPTS += USE_NONSTANDARD_DESCRIPTOR_NAMES\r
-LUFA_OPTS += CONTROL_ONLY_DEVICE\r
-LUFA_OPTS += FIXED_CONTROL_ENDPOINT_SIZE=32\r
-LUFA_OPTS += USE_SINGLE_DEVICE_CONFIGURATION\r
-LUFA_OPTS += USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"\r
-LUFA_OPTS += USE_RAM_DESCRIPTORS\r
+LUFA_OPTS = -D USB_DEVICE_ONLY\r
+LUFA_OPTS += -D USE_NONSTANDARD_DESCRIPTOR_NAMES\r
+LUFA_OPTS += -D CONTROL_ONLY_DEVICE\r
+LUFA_OPTS += -D FIXED_CONTROL_ENDPOINT_SIZE=32\r
+LUFA_OPTS += -D USE_SINGLE_DEVICE_CONFIGURATION\r
+LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"\r
+LUFA_OPTS += -D USE_RAM_DESCRIPTORS\r