Harris-Affine (Bug #1709)

I tried to install features2d. diff from patch #1053. However as soon as, I tried to compile, OpenCV with these modifications, I have a linking error :

../../lib/libopencv_features2d.so.2.3.1: undefined reference to cv::Elliptic_KeyPoint::Elliptic_KeyPoint(cv::Point_<int>, double, cv::Size_<int>, float, float)'

Actually the probleme comes from the definition of Elliptic_keypoint in features2d.hpp :

class CV_EXPORTS Elliptic_KeyPoint : public KeyPoint{
public:
Point centre;
Size_<float> axes;
double phi;
float size;
float si;
Mat transf;
Elliptic_KeyPoint();
Elliptic_KeyPoint(Point centre, double phi, Size axes, float size, float si);
virtual ~Elliptic_KeyPoint() ;
};

The problem is with the two last lines. They may have to be initialized ?