+#if !defined(CONFIG_KBD_BEEP) || (CONFIG_KBD_BEEP != 0 && CONFIG_KBD_BEEP != 1)
+ #error CONFIG_KBD_BEEP must be defined to either 0 or 1
+#endif
+#if !defined(CONFIG_KBD_OBSERVER) || (CONFIG_KBD_OBSERVER != 0 && CONFIG_KBD_OBSERVER != 1)
+ #error CONFIG_KBD_OBSERVER must be defined to either 0 or 1
+#endif