extern u_int32_t netmask; /* IP netmask to set on interface */
extern bool lockflag; /* Create lock file to lock the serial dev */
extern bool nodetach; /* Don't detach from controlling tty */
+#ifdef SYSTEMD
+extern bool up_sdnotify; /* Notify systemd once link is up (implies nodetach) */
+#endif
extern bool updetach; /* Detach from controlling tty when link up */
extern bool master_detach; /* Detach when multilink master without link */
extern char *initializer; /* Script to initialize physical link */