python2 binding build error: 'createOptFlow_DeepFlow' : is not a member of 'cv::optflow' (Bug #4109)

When compiling python2 binding of opencv 3.0 beta. Build error occurs: 'createOptFlow_DeepFlow' : is not a member of 'cv::optflow'

It's in the function below:

@static PyObject* pyopencv_cv_optflow_createOptFlow_DeepFlow(PyObject* , PyObject* args, PyObject* kw) {
using namespace cv::optflow;

Ptr<DenseOpticalFlow> retval;

if(PyObject_Size(args)  0 && (kw  NULL || PyObject_Size(kw) == 0))
{
        ERRWRAP2(retval = cv::optflow::createOptFlow_DeepFlow());
        return pyopencv_from(retval);
    }

return NULL;
}@

opencv_optflow was build successfully before building python2 binding. If change "createOptFlow_DeepFlow" to "createOptFlow_SimpleFlow", build success.