编译出错

[wq-july]

你好，我在Ubuntu18.04下手动下载编译opencv3.2.0并且把CMakeLists.txt文件的opencv都指定了路径，最终编译到96%报错。

/home/july/Project/Muti_KF_vio/orb_slam2_cg-ubuntu1804/orbslam2/lib/liborbslam2_core.so: undefined reference to `cv::line_descriptor::BinaryDescriptor::createBinaryDescriptor()'

/home/july/Project/Muti_KF_vio/orb_slam2_cg-ubuntu1804/orbslam2/lib/liborbslam2_core.so: undefined reference to `cv::line_descriptor::BinaryDescriptorMatcher::match(cv::Mat const&, cv::Mat const&, std::vector<cv::DMatch, std::allocator<cv::DMatch> >&, cv::Mat const&) const'

/home/july/Project/Muti_KF_vio/orb_slam2_cg-ubuntu1804/orbslam2/lib/liborbslam2_core.so: undefined reference to `cv::line_descriptor::BinaryDescriptorMatcher::createBinaryDescriptorMatcher()'

collect2: error: ld returned 1 exit status

orbslam2_ros/CMakeFiles/MonoLine.dir/build.make:181: recipe for target '/home/july/Project/Muti_KF_vio/orb_slam2_cg-

ubuntu1804/platforms/ros_wrapper/devel/lib/orbslam2_ros/MonoLine' failed

make[2]: *** [/home/july/Project/Muti_KF_vio/orb_slam2_cg-ubuntu1804/platforms/ros_wrapper/devel/lib/orbslam2_ros/MonoLine] Error 1

CMakeFiles/Makefile2:1057: recipe for target 'orbslam2_ros/CMakeFiles/MonoLine.dir/all' failed

[wq-july]

您好，我通过安装opencv对应的contrib模块解决了问题，我发现cv::line_descriptor是属于contrib中的模块。

[cggos]

@July-creater 在Ubuntu18.04，我是通过 sudo apt install libopencv-dev 安装的opencv3.2

[wq-july]

好的谢谢，我在虚拟机上试了一下，也成功了！！非常感谢！