@echo OBJ=$(OBJ)
# Create build directory
-$(shell mkdir $(BUILD_DIR) 2>/dev/null)
+$(shell mkdir -p $(BUILD_DIR) 2>/dev/null)
# Create object files directory
-$(eval $(foreach OUTPUT,$(OUTPUTS),$(shell mkdir $(OUTPUT) 2>/dev/null)))
+$(eval $(foreach OUTPUT,$(OUTPUTS),$(shell mkdir -p $(OUTPUT) 2>/dev/null)))
# Include the dependency files.
-include $(patsubst %.o,%.d,$(OBJ))