it was defined in both fg_props.cxx and newauto.cxx
This is I believe where it belongs. (NHV)
#include "newauto.hxx"
-#define DEFAULT_AP_HEADING_LOCK FGAutopilot::FG_DG_HEADING_LOCK
-
FGAutopilot *current_autopilot;
extern FGAutopilot *current_autopilot;
+#define DEFAULT_AP_HEADING_LOCK FGAutopilot::FG_DG_HEADING_LOCK
+// #define DEFAULT_AP_HEADING_LOCK FGAutopilot::FG_TRUE_HEADING_LOCK
#endif // _NEWAUTO_HXX
SG_USING_STD(ostream);
#endif
-#define DEFAULT_AP_HEADING_LOCK FGAutopilot::FG_DG_HEADING_LOCK
-
static double getWindNorth ();
static double getWindEast ();
static double getWindDown ();