# Sanity check user supplied values
$(foreach MANDATORY_VAR, $(LUFA_BUILD_MANDATORY_VARS), $(call ERROR_IF_UNSET, $(MANDATORY_VAR)))
-$(call ERROR_IF_EMPTY, LUFA_PATH)
+$(call ERROR_IF_EMPTY, DOXYGEN_CONF)
$(call ERROR_IF_EMPTY, LUFA_PATH)
$(call ERROR_IF_NONBOOL, DOXYGEN_FAIL_ON_WARNING)