extern int default_device; /* Using /dev/tty or equivalent */
extern char devnam[MAXPATHLEN]; /* Device name */
extern int crtscts; /* Use hardware flow control */
+extern int stop_bits; /* Number of serial port stop bits */
extern bool modem; /* Use modem control lines */
extern int inspeed; /* Input/Output speed requested */
extern u_int32_t netmask; /* IP netmask to set on interface */