undefined reference to `cv::DescriptorMatcher::knnMatch #1

[ZaferAlemdaroglu]

Hi! Ive downloaded your project and while compiling Ive run into such a problem:
undefined reference to `cv::DescriptorMatcher::knnMatch
in native_lib.cpp.
Can you help me, please?
That is my CMakeLists.txt
https://gist.github.com/Ivanhanden/0e9db8ca7da41a695cef713021946d73

List of includes in native_lib.cpp
#include <jni.h>
#include
#include <opencv2/opencv.hpp>
#include <stdio.h>
#include <android/log.h>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/features2d/features2d.hpp>
#include

Same problem i have i use ndk17c and opencv 3.4.4 sdk

How can i solve?

[shehel]

Must be the way you are importing features2d. Please check my source code again.