diff --git a/build_keyboard.mk b/build_keyboard.mk
index 164794c63..5bec4ecf6 100644
--- a/build_keyboard.mk
+++ b/build_keyboard.mk
@@ -23,6 +23,16 @@ ifdef master
 	MASTER = $(master)
 endif
 
+ifeq ($(MASTER),right)	
+	OPT_DEFS += -DMASTER_IS_ON_RIGHT
+else 
+	ifneq ($(MASTER),left)
+$(error MASTER does not have a valid value(left/right))
+	endif
+endif
+
+
+
 KEYBOARD_PATH := keyboards/$(KEYBOARD)
 KEYBOARD_C := $(KEYBOARD_PATH)/$(KEYBOARD).c
 
@@ -169,15 +179,14 @@ ifneq ($(SUBPROJECT),)
 	VPATH += $(SUBPROJECT_PATH)
 endif
 VPATH += $(KEYBOARD_PATH)
-VPATH += $(TOP_DIR)
-VPATH += $(TMK_PATH)
-VPATH += $(QUANTUM_PATH)
-VPATH += $(QUANTUM_PATH)/keymap_extras
-VPATH += $(QUANTUM_PATH)/audio
-VPATH += $(QUANTUM_PATH)/process_keycode
+VPATH += $(COMMON_VPATH)
 
 
 include $(TMK_PATH)/common.mk
+SRC += $(TMK_COMMON_SRC)
+OPT_DEFS += $(TMK_COMMON_DEFS)
+EXTRALDFLAGS += $(TMK_COMMON_LDFLAGS)
+
 ifeq ($(PLATFORM),AVR)
 	include $(TMK_PATH)/protocol/lufa.mk
 	include $(TMK_PATH)/avr.mk
@@ -189,11 +198,13 @@ ifeq ($(strip $(VISUALIZER_ENABLE)), yes)
 	include $(VISUALIZER_PATH)/visualizer.mk
 endif
 
+$(info $(VPATH))
+
 
 OUTPUTS := $(KEYMAP_OUTPUT) $(KEYBOARD_OUTPUT)
 $(KEYMAP_OUTPUT)_SRC := $(SRC)
 $(KEYMAP_OUTPUT)_DEFS := $(OPT_DEFS) -DQMK_KEYBOARD=\"$(KEYBOARD)\" -DQMK_KEYMAP=\"$(KEYMAP)\" 
-$(KEYMAP_OUTPUT)_INC := $(EXTRAINCDIRS) $(VPATH)
+$(KEYMAP_OUTPUT)_INC :=  $(VPATH) $(EXTRAINCDIRS)
 $(KEYMAP_OUTPUT)_CONFIG := $(CONFIG_H)
 $(KEYBOARD_OUTPUT)_SRC := $(CHIBISRC)
 $(KEYBOARD_OUTPUT)_DEFS := $(PROJECT_DEFS)
diff --git a/build_test.mk b/build_test.mk
index 1d8cb08b1..9f5d6e0af 100644
--- a/build_test.mk
+++ b/build_test.mk
@@ -38,6 +38,9 @@ VPATH +=\
 
 all: elf
 
+VPATH += $(COMMON_VPATH)
+
+include $(TMK_PATH)/common.mk
 include $(QUANTUM_PATH)/serial_link/tests/rules.mk
 
 $(TEST_OBJ)/$(TEST)_SRC := $($(TEST)_SRC)
diff --git a/common.mk b/common.mk
index f9b0773a8..18751cd5a 100644
--- a/common.mk
+++ b/common.mk
@@ -17,10 +17,10 @@ SERIAL_SRC := $(wildcard $(SERIAL_PATH)/protocol/*.c)
 SERIAL_SRC += $(wildcard $(SERIAL_PATH)/system/*.c)
 SERIAL_DEFS += -DSERIAL_LINK_ENABLE
 
-VPATH += $(TOP_DIR)
-VPATH += $(TMK_PATH)
-VPATH += $(QUANTUM_PATH)
-VPATH += $(QUANTUM_PATH)/keymap_extras
-VPATH += $(QUANTUM_PATH)/audio
-VPATH += $(QUANTUM_PATH)/process_keycode
-VPATH += $(SERIAL_PATH)
\ No newline at end of file
+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 += $(SERIAL_PATH)
\ No newline at end of file
diff --git a/tmk_core/common.mk b/tmk_core/common.mk
index 0b767eb04..f826a7b54 100644
--- a/tmk_core/common.mk
+++ b/tmk_core/common.mk
@@ -5,7 +5,7 @@ else ifeq ($(PLATFORM),CHIBIOS)
 	PLATFORM_COMMON_DIR = $(COMMON_DIR)/chibios
 endif
 
-SRC +=	$(COMMON_DIR)/host.c \
+TMK_COMMON_SRC +=	$(COMMON_DIR)/host.c \
 	$(COMMON_DIR)/keyboard.c \
 	$(COMMON_DIR)/action.c \
 	$(COMMON_DIR)/action_tapping.c \
@@ -21,98 +21,89 @@ SRC +=	$(COMMON_DIR)/host.c \
 	$(PLATFORM_COMMON_DIR)/bootloader.c \
 
 ifeq ($(PLATFORM),AVR)
-	SRC += $(PLATFORM_COMMON_DIR)/xprintf.S
+	TMK_COMMON_SRC += $(PLATFORM_COMMON_DIR)/xprintf.S
 endif 
 
 ifeq ($(PLATFORM),CHIBIOS)
-	SRC += $(PLATFORM_COMMON_DIR)/printf.c
-	SRC += $(PLATFORM_COMMON_DIR)/eeprom.c
+	TMK_COMMON_SRC += $(PLATFORM_COMMON_DIR)/printf.c
+	TMK_COMMON_SRC += $(PLATFORM_COMMON_DIR)/eeprom.c
 endif
 
 
 
 # Option modules
 ifeq ($(strip $(BOOTMAGIC_ENABLE)), yes)
-    OPT_DEFS += -DBOOTMAGIC_ENABLE
-    SRC += $(COMMON_DIR)/bootmagic.c
+    TMK_COMMON_DEFS += -DBOOTMAGIC_ENABLE
+    TMK_COMMON_SRC += $(COMMON_DIR)/bootmagic.c
 else
-    OPT_DEFS += -DMAGIC_ENABLE
-    SRC += $(COMMON_DIR)/magic.c
+    TMK_COMMON_DEFS += -DMAGIC_ENABLE
+    TMK_COMMON_SRC += $(COMMON_DIR)/magic.c
 endif
 
 ifeq ($(strip $(MOUSEKEY_ENABLE)), yes)
-    SRC += $(COMMON_DIR)/mousekey.c
-    OPT_DEFS += -DMOUSEKEY_ENABLE
-    OPT_DEFS += -DMOUSE_ENABLE
+    TMK_COMMON_SRC += $(COMMON_DIR)/mousekey.c
+    TMK_COMMON_DEFS += -DMOUSEKEY_ENABLE
+    TMK_COMMON_DEFS += -DMOUSE_ENABLE
 endif
 
 ifeq ($(strip $(EXTRAKEY_ENABLE)), yes)
-    OPT_DEFS += -DEXTRAKEY_ENABLE
+    TMK_COMMON_DEFS += -DEXTRAKEY_ENABLE
 endif
 
 ifeq ($(strip $(CONSOLE_ENABLE)), yes)
-    OPT_DEFS += -DCONSOLE_ENABLE
+    TMK_COMMON_DEFS += -DCONSOLE_ENABLE
 else
-    OPT_DEFS += -DNO_PRINT
-    OPT_DEFS += -DNO_DEBUG
+    TMK_COMMON_DEFS += -DNO_PRINT
+    TMK_COMMON_DEFS += -DNO_DEBUG
 endif
 
 ifeq ($(strip $(COMMAND_ENABLE)), yes)
-    SRC += $(COMMON_DIR)/command.c
-    OPT_DEFS += -DCOMMAND_ENABLE
+    TMK_COMMON_SRC += $(COMMON_DIR)/command.c
+    TMK_COMMON_DEFS += -DCOMMAND_ENABLE
 endif
 
 ifeq ($(strip $(NKRO_ENABLE)), yes)
-    OPT_DEFS += -DNKRO_ENABLE
+    TMK_COMMON_DEFS += -DNKRO_ENABLE
 endif
 
 ifeq ($(strip $(USB_6KRO_ENABLE)), yes)
-    OPT_DEFS += -DUSB_6KRO_ENABLE
+    TMK_COMMON_DEFS += -DUSB_6KRO_ENABLE
 endif
 
 ifeq ($(strip $(SLEEP_LED_ENABLE)), yes)
-    SRC += $(PLATFORM_COMMON_DIR)/sleep_led.c
-    OPT_DEFS += -DSLEEP_LED_ENABLE
-    OPT_DEFS += -DNO_SUSPEND_POWER_DOWN
+    TMK_COMMON_SRC += $(PLATFORM_COMMON_DIR)/sleep_led.c
+    TMK_COMMON_DEFS += -DSLEEP_LED_ENABLE
+    TMK_COMMON_DEFS += -DNO_SUSPEND_POWER_DOWN
 endif
 
 ifeq ($(strip $(BACKLIGHT_ENABLE)), yes)
-    SRC += $(COMMON_DIR)/backlight.c
-    OPT_DEFS += -DBACKLIGHT_ENABLE
+    TMK_COMMON_SRC += $(COMMON_DIR)/backlight.c
+    TMK_COMMON_DEFS += -DBACKLIGHT_ENABLE
 endif
 
 ifeq ($(strip $(BLUETOOTH_ENABLE)), yes)
-    OPT_DEFS += -DBLUETOOTH_ENABLE
+    TMK_COMMON_DEFS += -DBLUETOOTH_ENABLE
 endif
 
 ifeq ($(strip $(ONEHAND_ENABLE)), yes)
-    OPT_DEFS += -DONEHAND_ENABLE
+    TMK_COMMON_DEFS += -DONEHAND_ENABLE
 endif
 
 ifeq ($(strip $(KEYMAP_SECTION_ENABLE)), yes)
-    OPT_DEFS += -DKEYMAP_SECTION_ENABLE
+    TMK_COMMON_DEFS += -DKEYMAP_SECTION_ENABLE
 
     ifeq ($(strip $(MCU)),atmega32u2)
-	EXTRALDFLAGS = -Wl,-L$(TMK_DIR),-Tldscript_keymap_avr35.x
+	TMK_COMMON_LDFLAGS = -Wl,-L$(TMK_DIR),-Tldscript_keymap_avr35.x
     else ifeq ($(strip $(MCU)),atmega32u4)
-	EXTRALDFLAGS = -Wl,-L$(TMK_DIR),-Tldscript_keymap_avr5.x
+	TMK_COMMON_LDFLAGS = -Wl,-L$(TMK_DIR),-Tldscript_keymap_avr5.x
     else
-	EXTRALDFLAGS = $(error no ldscript for keymap section)
+	TMK_COMMON_LDFLAGS = $(error no ldscript for keymap section)
     endif
 endif
 
-ifeq ($(MASTER),right)	
-	OPT_DEFS += -DMASTER_IS_ON_RIGHT
-else 
-	ifneq ($(MASTER),left)
-$(error MASTER does not have a valid value(left/right))
-	endif
-endif
-
-
 # Bootloader address
 ifdef STM32_BOOTLOADER_ADDRESS
-    OPT_DEFS += -DSTM32_BOOTLOADER_ADDRESS=$(STM32_BOOTLOADER_ADDRESS)
+    TMK_COMMON_DEFS += -DSTM32_BOOTLOADER_ADDRESS=$(STM32_BOOTLOADER_ADDRESS)
 endif
 
 # Search Path