void ui_cb_about(GtkMenuItem *mi, gpointer data);
void ui_cb_menu_quit(GtkMenuItem *mi, gpointer data);
void ui_cb_sensor_preferences(GtkMenuItem *mi, gpointer data);
void ui_cb_about(GtkMenuItem *mi, gpointer data);
void ui_cb_menu_quit(GtkMenuItem *mi, gpointer data);
void ui_cb_sensor_preferences(GtkMenuItem *mi, gpointer data);