#include <GccEnt_Position.hxx>
#include <gp_Pnt2d.hxx>
#include <Standard_Real.hxx>
-class StdFail_NotDone;
class GccEnt_QualifiedCirc;
class Geom2dGcc_QCurve;
class gp_Lin2d;
class GccEnt_QualifiedLin;
-class gp_Pnt2d;
-class gp_Circ2d;
class Geom2dAdaptor_Curve;