//
// This file is in the Public Domain and comes with no warranty.
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
#include "slip_skid_ball.hxx"
#include <Main/fg_props.hxx>
#include <Main/util.hxx>
+using std::string;
SlipSkidBall::SlipSkidBall ( SGPropertyNode *node)
: