-extern SERIALPORT *serial_open ( const char *device );
-extern void serial_close ( SERIALPORT *port );
-extern int serial_getchar ( SERIALPORT *port );
-extern int serial_putchar ( SERIALPORT *port, unsigned char ch );
-extern void serial_flush ( SERIALPORT *port );
+extern SERIALPORT *fg_serial_open ( const char *device );
+extern void fg_serial_close ( SERIALPORT *port );
+extern int fg_serial_getchar ( SERIALPORT *port );
+extern int fg_serial_putchar ( SERIALPORT *port, unsigned char ch );
+extern void fg_serial_flush ( SERIALPORT *port );