-#ifndef __cplusplus
-# error This library requires C++
-#endif
-
-#include <simgear/misc/props.hxx>
-#include <Main/fgfs.hxx>
-
-
-class SGInterpTable;
+#include <simgear/props/props.hxx>
+#include <simgear/props/tiedpropertylist.hxx>
+#include <simgear/structure/subsystem_mgr.hxx>
+#include <Environment/atmosphere.hxx>