#include <iosfwd>
#include <simgear/structure/subsystem_mgr.hxx>
-#include <simgear/math/SGMath.hxx>
+#include <simgear/props/tiedpropertylist.hxx>
#include <Main/globals.hxx>
void bind ();
void unbind ();
void update (double dt);
+
+private:
+ simgear::TiedPropertyList _tiedProperties;
};