LUFA_OPTS += -D VTARGET_ADC_CHANNEL=2
 LUFA_OPTS += -D VTARGET_REF_VOLTS=5
 LUFA_OPTS += -D VTARGET_SCALE_FACTOR=1
+#LUFA_OPTS += -D VTARGET_USE_INTERNAL_REF
 #LUFA_OPTS += -D NO_VTARGET_DETECT
 #LUFA_OPTS += -D LIBUSB_DRIVER_COMPAT
 #LUFA_OPTS += -D XCK_RESCUE_CLOCK_ENABLE
 CFLAGS += -fpack-struct
 CFLAGS += -fshort-enums
 CFLAGS += -fno-strict-aliasing
+CFLAGS += -fno-split-wide-types
 CFLAGS += -Wall
 CFLAGS += -Wstrict-prototypes
 #CFLAGS += -mshort-calls