+BUILD_DIR := $(TOP_DIR)/.build
+
+SERIAL_DIR := $(QUANTUM_DIR)/serial_link
+SERIAL_PATH := $(QUANTUM_PATH)/serial_link
+SERIAL_SRC := $(wildcard $(SERIAL_PATH)/protocol/*.c)
+SERIAL_SRC += $(wildcard $(SERIAL_PATH)/system/*.c)
+SERIAL_DEFS += -DSERIAL_LINK_ENABLE
+
+COMMON_VPATH := $(TOP_DIR)
+COMMON_VPATH += $(TMK_PATH)
+COMMON_VPATH += $(QUANTUM_PATH)
+COMMON_VPATH += $(QUANTUM_PATH)/keymap_extras
+COMMON_VPATH += $(QUANTUM_PATH)/audio
+COMMON_VPATH += $(QUANTUM_PATH)/process_keycode
+COMMON_VPATH += $(QUANTUM_PATH)/api
+COMMON_VPATH += $(SERIAL_PATH)
\ No newline at end of file