//
// $Id$
+#ifdef HAVE_CONFIG_H
+# include <simgear_config.h>
+#endif
#include <simgear/compiler.h>
#include "interpolater.hxx"
-SG_USING_STD(string);
+#include <simgear/math/SGMath.hxx>
+
+using std::string;
// Constructor -- starts with an empty table.
SGInterpTable::SGInterpTable()