Error whild building ov_core

[bckim1318]

[ 68%] Built target ov_core_lib
[ 73%] Linking CXX executable /home/ivy/workspace/catkin_ws_ov/devel/.private/ov_core/lib/ov_core/test_tracking
[ 78%] Linking CXX executable /home/ivy/workspace/catkin_ws_ov/devel/.private/ov_core/lib/ov_core/test_repeat
[ 84%] Linking CXX executable /home/ivy/workspace/catkin_ws_ov/devel/.private/ov_core/lib/ov_core/test_simulator
/home/ivy/workspace/catkin_ws_ov/devel/.private/ov_core/lib/libov_core_lib.so: undefined reference to `cv::aruco::detectMarkers(cv::_InputArray const&, cv::Ptr<cv::aruco::Dictionary> const&, cv::_OutputArray const&, cv::_OutputArray const&, cv::Ptr<cv::aruco::DetectorParameters> const&, cv::_OutputArray const&, cv::_InputArray const&, cv::_InputArray const&)'
collect2: error: ld returned 1 exit status
/home/ivy/workspace/catkin_ws_ov/devel/.private/ov_core/lib/libov_core_lib.so: undefined reference to `cv::aruco::detectMarkers(cv::_InputArray const&, cv::Ptr<cv::aruco::Dictionary> const&, cv::_OutputArray const&, cv::_OutputArray const&, cv::Ptr<cv::aruco::DetectorParameters> const&, cv::_OutputArray const&, cv::_InputArray const&, cv::_InputArray const&)'
CMakeFiles/test_repeat.dir/build.make:219: recipe for target '/home/ivy/workspace/catkin_ws_ov/devel/.private/ov_core/lib/ov_core/test_repeat' failed
make[2]: *** [/home/ivy/workspace/catkin_ws_ov/devel/.private/ov_core/lib/ov_core/test_repeat] Error 1
collect2: error: ld returned 1 exit status
CMakeFiles/Makefile2:2418: recipe for target 'CMakeFiles/test_repeat.dir/all' failed
make[1]: *** [CMakeFiles/test_repeat.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
CMakeFiles/test_simulator.dir/build.make:219: recipe for target '/home/ivy/workspace/catkin_ws_ov/devel/.private/ov_core/lib/ov_core/test_simulator' failed
make[2]: *** [/home/ivy/workspace/catkin_ws_ov/devel/.private/ov_core/lib/ov_core/test_simulator] Error 1
CMakeFiles/Makefile2:2381: recipe for target 'CMakeFiles/test_simulator.dir/all' failed
make[1]: *** [CMakeFiles/test_simulator.dir/all] Error 2
/home/ivy/workspace/catkin_ws_ov/devel/.private/ov_core/lib/libov_core_lib.so: undefined reference to `cv::aruco::detectMarkers(cv::_InputArray const&, cv::Ptr<cv::aruco::Dictionary> const&, cv::_OutputArray const&, cv::_OutputArray const&, cv::Ptr<cv::aruco::DetectorParameters> const&, cv::_OutputArray const&, cv::_InputArray const&, cv::_InputArray const&)'
collect2: error: ld returned 1 exit status
CMakeFiles/test_tracking.dir/build.make:219: recipe for target '/home/ivy/workspace/catkin_ws_ov/devel/.private/ov_core/lib/ov_core/test_tracking' failed
make[2]: *** [/home/ivy/workspace/catkin_ws_ov/devel/.private/ov_core/lib/ov_core/test_tracking] Error 1
CMakeFiles/Makefile2:899: recipe for target 'CMakeFiles/test_tracking.dir/all' failed
make[1]: *** [CMakeFiles/test_tracking.dir/all] Error 2
Makefile:140: recipe for target 'all' failed
make: *** [all] Error 2

I'm trying to build open vins, but it fails. How can I fix it?

[goldbattle]

It looks like it is unable to find the aruco module.

• Did you build opencv with the contrib modules?
• What version of opencv are you using?

See this opencv install guide: https://docs.openvins.com/gs-installing.html#gs-install-opencv

[bckim1318]

I installed opencv follwing installation guide.

git clone --branch 3.4.6 https://github.com/opencv/opencv/ git clone --branch 3.4.6 https://github.com/opencv/opencv_contrib/ mkdir opencv/build/ cd opencv/build/ cmake -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules .. make -j8 sudo make install

And I can import aruco module in python, so I think contrib module are installed well.

[goldbattle]

From your error it looks like it can't find the aruco module. I would check what version of opencv the ov_core library finds, you might have to specify the specific version if you have multiple installs on your system.

[Jin-Linhao]

I modify the CMakeLists to find_package(OpenCV 3.4 REQUIRED) and it works.

[meitiever]

Did a little test on this issue, OpenCV 3.2 is not compatible with ov. 3.3.1 is ok.