+ vgl->serial_port = NULL;
+
+#ifndef WINDOWS
+ /* Attempt to auto set default USB serial port entry */
+ /* Ordered to make lowest device favourite if available */
+ if (g_access ("/dev/ttyUSB1", R_OK) == 0) {
+ if (vgl->serial_port != NULL)
+ g_free (vgl->serial_port);
+ vgl->serial_port = g_strdup ("/dev/ttyUSB1");
+ }
+ if (g_access ("/dev/ttyUSB0", R_OK) == 0) {
+ if (vgl->serial_port != NULL)
+ g_free (vgl->serial_port);
+ vgl->serial_port = g_strdup ("/dev/ttyUSB0");
+ }
+#endif