+# Pull in rules.mk files from all our subfolders
+ifneq ("$(wildcard $(KEYBOARD_PATH_5)/rules.mk)","")
+ include $(KEYBOARD_PATH_5)/rules.mk
+endif
+ifneq ("$(wildcard $(KEYBOARD_PATH_4)/rules.mk)","")
+ include $(KEYBOARD_PATH_4)/rules.mk
+endif
+ifneq ("$(wildcard $(KEYBOARD_PATH_3)/rules.mk)","")
+ include $(KEYBOARD_PATH_3)/rules.mk
+endif
+ifneq ("$(wildcard $(KEYBOARD_PATH_2)/rules.mk)","")
+ include $(KEYBOARD_PATH_2)/rules.mk
+endif
+ifneq ("$(wildcard $(KEYBOARD_PATH_1)/rules.mk)","")
+ include $(KEYBOARD_PATH_1)/rules.mk
+endif
+
+# Find all the C source files to be compiled in subfolders.
+KEYBOARD_SRC :=
+
+KEYBOARD_C_1 := $(KEYBOARD_PATH_1)/$(KEYBOARD_FOLDER_1).c
+KEYBOARD_C_2 := $(KEYBOARD_PATH_2)/$(KEYBOARD_FOLDER_2).c
+KEYBOARD_C_3 := $(KEYBOARD_PATH_3)/$(KEYBOARD_FOLDER_3).c
+KEYBOARD_C_4 := $(KEYBOARD_PATH_4)/$(KEYBOARD_FOLDER_4).c
+KEYBOARD_C_5 := $(KEYBOARD_PATH_5)/$(KEYBOARD_FOLDER_5).c
+
+ifneq ("$(wildcard $(KEYBOARD_C_5))","")
+ KEYBOARD_SRC += $(KEYBOARD_C_5)
+endif
+ifneq ("$(wildcard $(KEYBOARD_C_4))","")
+ KEYBOARD_SRC += $(KEYBOARD_C_4)
+endif
+ifneq ("$(wildcard $(KEYBOARD_C_3))","")
+ KEYBOARD_SRC += $(KEYBOARD_C_3)
+endif
+ifneq ("$(wildcard $(KEYBOARD_C_2))","")
+ KEYBOARD_SRC += $(KEYBOARD_C_2)
+endif
+ifneq ("$(wildcard $(KEYBOARD_C_1))","")
+ KEYBOARD_SRC += $(KEYBOARD_C_1)
+endif
+
+# Generate KEYBOARD_name_subname for all levels of the keyboard folder
+KEYBOARD_FILESAFE_1 := $(subst .,,$(subst /,_,$(KEYBOARD_FOLDER_PATH_1)))
+KEYBOARD_FILESAFE_2 := $(subst .,,$(subst /,_,$(KEYBOARD_FOLDER_PATH_2)))
+KEYBOARD_FILESAFE_3 := $(subst .,,$(subst /,_,$(KEYBOARD_FOLDER_PATH_3)))
+KEYBOARD_FILESAFE_4 := $(subst .,,$(subst /,_,$(KEYBOARD_FOLDER_PATH_4)))
+KEYBOARD_FILESAFE_5 := $(subst .,,$(subst /,_,$(KEYBOARD_FOLDER_PATH_5)))
+
+ifneq ("$(wildcard $(KEYBOARD_PATH_5)/)","")
+ OPT_DEFS += -DKEYBOARD_$(KEYBOARD_FILESAFE_5)
+endif
+ifneq ("$(wildcard $(KEYBOARD_PATH_4)/)","")
+ OPT_DEFS += -DKEYBOARD_$(KEYBOARD_FILESAFE_4)
+endif
+ifneq ("$(wildcard $(KEYBOARD_PATH_3)/)","")
+ OPT_DEFS += -DKEYBOARD_$(KEYBOARD_FILESAFE_3)
+endif
+ifneq ("$(wildcard $(KEYBOARD_PATH_2)/)","")
+ OPT_DEFS += -DKEYBOARD_$(KEYBOARD_FILESAFE_2)
+endif
+ifneq ("$(wildcard $(KEYBOARD_PATH_1)/)","")
+ OPT_DEFS += -DKEYBOARD_$(KEYBOARD_FILESAFE_1)