catkin_make:Project ‘cv_bridge‘ specifies ‘/usr/include/opencv‘ as an include dir, which is not fo_project 'cv_bridge' specifies '/usr/include/opencv

编译darknet_ros时遇到的问题

报错信息：

- Found OpenCV: /usr (found version "4.1.1") 
CMake Error at /opt/ros/melodic/share/cv_bridge/cmake/cv_bridgeConfig.cmake:113 (message):
  Project 'cv_bridge' specifies '/usr/include/opencv' as an include dir,
  which is not found.  It does neither exist as an absolute directory nor in
  '${{prefix}}//usr/include/opencv'.  Check the issue tracker
  'https://github.com/ros-perception/vision_opencv/issues' and consider
  creating a ticket if the problem has not been reported yet.
Call Stack (most recent call first):
  /opt/ros/melodic/share/catkin/cmake/catkinConfig.cmake:76 (find_package)
  darknet_ros/darknet_ros/CMakeLists.txt:52 (find_package)


-- Configuring incomplete, errors occurred!
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错误原因：

opencv版本较高，编译程序寻找/usr/include/opencv，但本机并没有
cd /usr/include
ll opencv*
只能发现opencv4这个目录，因为本机安装的较高版本的opencv

解决办法：

cd /usr/include
#你的本机目录对应你的opencv版本，设置链接后解决，不必再改CMakeList
ln -s opencv4 opencv
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