#include <simgear/ephemeris/ephemeris.hxx>
#include <simgear/magvar/magvar.hxx>
#include <simgear/scene/material/matlib.hxx>
+#include <simgear/structure/subsystem_mgr.hxx>
+#include <simgear/structure/event_mgr.hxx>
#include <Aircraft/controls.hxx>
#include <Airports/runways.hxx>