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" Are there library linking issues?" no, i'd rather think, the `#ifdef``'ed code is out of date , and was not tested from the buildbot

" Are there library linking issues?" no, i'd rather think, the `#ifdef``'ed code is out of date , and was not tested from the buildbotbuildbot.

SurfFeatureDetector detector(minHessian);

Ptr<xfeatures2d::SURF> detector = xfeatures2d::SURF::create(minHessian);

" Are there library linking issues?" no, i'd rather think, the `#ifdef``'ed code is out of date , and was not tested from the buildbot.

you can't create SURF/SIFT instances on the stack anymore, instead of

SurfFeatureDetector detector(minHessian);

it now will have to be:

//-- Step 1: Detect the keypoints and extract descriptors using SURF
int minHessian = 400;

//SurfFeatureDetector detector(minHessian);
Ptr<xfeatures2d::SURF> detector surf = xfeatures2d::SURF::create(minHessian);

// note, that it's also far more efficient, to compute keypoints and descriptors in one go.

std::vector<KeyPoint> keypoints_object, keypoints_scene;
Mat descriptors_object, descriptors_scene;

surf->detectAndCompute(gray_image1, Mat(), keypoints_object, descriptors_object);
surf->detectAndCompute(gray_image2, Mat(), keypoints_scene,  descriptors_scene);