-ifneq ($(strip $(CUSTOM_MATRIX)), yes)
- QUANTUM_SRC += $(QUANTUM_DIR)/matrix.c
+DEBOUNCE_DIR:= $(QUANTUM_DIR)/debounce
+# Debounce Modules. Set DEBOUNCE_TYPE=custom if including one manually.
+DEBOUNCE_TYPE?= sym_g
+ifneq ($(strip $(DEBOUNCE_TYPE)), custom)
+ QUANTUM_SRC += $(DEBOUNCE_DIR)/$(strip $(DEBOUNCE_TYPE)).c
+endif
+
+ifeq ($(strip $(SPLIT_KEYBOARD)), yes)
+ OPT_DEFS += -DSPLIT_KEYBOARD
+
+ # Include files used by all split keyboards
+ QUANTUM_SRC += $(QUANTUM_DIR)/split_common/split_util.c
+
+ # Determine which (if any) transport files are required
+ ifneq ($(strip $(SPLIT_TRANSPORT)), custom)
+ QUANTUM_SRC += $(QUANTUM_DIR)/split_common/transport.c
+ # Functions added via QUANTUM_LIB_SRC are only included in the final binary if they're called.
+ # Unused functions are pruned away, which is why we can add multiple drivers here without bloat.
+ QUANTUM_LIB_SRC += $(QUANTUM_DIR)/split_common/serial.c \
+ i2c_master.c \
+ i2c_slave.c
+ endif
+ COMMON_VPATH += $(QUANTUM_PATH)/split_common