Ubuntu20.04 ros-noetic下opencv多版本问题may conflict with libopencv_highgui.so.4.2

问题

当编译某程序包时，出现如下警告，但是编译通过。

/usr/bin/ld: warning: libopencv_highgui.so.406, needed by /lidar_slam_ws/devel/lib/libvikit_common.so, may conflict with libopencv_highgui.so.4.2
/usr/bin/ld: warning: libopencv_calib3d.so.406, needed by /lidar_slam_ws/devel/lib/libvikit_common.so, may conflict with libopencv_calib3d.so.4.2

解决

情况1

执行一下程序，如果程序运行没有问题，那就忽略，直接划走

情况2

程序崩溃，那就需要指定opencv版本了

方法

设置 OpenCV 环境变量

当前终端生效

export OpenCV_DIR=/usr/local/lib/cmake/opencv4

将上述命令添加到 ~/.bashrc 中，使其永久生效

echo "export OpenCV_DIR=/usr/local/lib/cmake/opencv4" >> ~/.bashrc
source ~/.bashrc