+
+MAIN_KEYMAP_PATH_1 := $(KEYBOARD_PATH_1)/keymaps/$(KEYMAP)
+MAIN_KEYMAP_PATH_2 := $(KEYBOARD_PATH_2)/keymaps/$(KEYMAP)
+MAIN_KEYMAP_PATH_3 := $(KEYBOARD_PATH_3)/keymaps/$(KEYMAP)
+MAIN_KEYMAP_PATH_4 := $(KEYBOARD_PATH_4)/keymaps/$(KEYMAP)
+MAIN_KEYMAP_PATH_5 := $(KEYBOARD_PATH_5)/keymaps/$(KEYMAP)
+
+ifneq ("$(wildcard $(MAIN_KEYMAP_PATH_5)/keymap.c)","")
+ -include $(MAIN_KEYMAP_PATH_5)/rules.mk
+ KEYMAP_C := $(MAIN_KEYMAP_PATH_5)/keymap.c
+ KEYMAP_PATH := $(MAIN_KEYMAP_PATH_5)
+else ifneq ("$(wildcard $(MAIN_KEYMAP_PATH_4)/keymap.c)","")
+ -include $(MAIN_KEYMAP_PATH_4)/rules.mk
+ KEYMAP_C := $(MAIN_KEYMAP_PATH_4)/keymap.c
+ KEYMAP_PATH := $(MAIN_KEYMAP_PATH_4)
+else ifneq ("$(wildcard $(MAIN_KEYMAP_PATH_3)/keymap.c)","")
+ -include $(MAIN_KEYMAP_PATH_3)/rules.mk
+ KEYMAP_C := $(MAIN_KEYMAP_PATH_3)/keymap.c
+ KEYMAP_PATH := $(MAIN_KEYMAP_PATH_3)
+else ifneq ("$(wildcard $(MAIN_KEYMAP_PATH_2)/keymap.c)","")
+ -include $(MAIN_KEYMAP_PATH_2)/rules.mk
+ KEYMAP_C := $(MAIN_KEYMAP_PATH_2)/keymap.c
+ KEYMAP_PATH := $(MAIN_KEYMAP_PATH_2)
+else ifneq ("$(wildcard $(MAIN_KEYMAP_PATH_1)/keymap.c)","")
+ -include $(MAIN_KEYMAP_PATH_1)/rules.mk
+ KEYMAP_C := $(MAIN_KEYMAP_PATH_1)/keymap.c
+ KEYMAP_PATH := $(MAIN_KEYMAP_PATH_1)
+else ifneq ($(LAYOUTS),)
+ include build_layout.mk
+else
+ $(error Could not find keymap)
+ # this state should never be reached
+endif
+
+ifeq ($(strip $(CTPC)), yes)
+ CONVERT_TO_PROTON_C=yes
+endif
+
+ifeq ($(strip $(CONVERT_TO_PROTON_C)), yes)
+ TARGET := $(TARGET)_proton_c
+ include $(STM32_PATH)/proton_c.mk
+ OPT_DEFS += -DCONVERT_TO_PROTON_C
+endif
+
+include quantum/mcu_selection.mk
+
+ifdef MCU_FAMILY
+ OPT_DEFS += -DQMK_STM32
+ KEYBOARD_PATHS += $(STM32_PATH)
+endif
+
+