'Problem compiling ar_pose (openCV fatal error)

I'm getting an error when trying to compile ar_pose, as part of ar_tools in ROS noetic under Ubuntu 20.04.

When running catkin_make:

In file included from /home/alveybj/catkin_ws/src/ar_tools/ar_pose/src/ar_multi.cpp:25:
/home/alveybj/catkin_ws/src/ar_tools/ar_pose/include/ar_pose/ar_multi.h:47:10: fatal error: opencv/cv.h: No such file or directory
   47 | #include <opencv/cv.h>

Do I need to downgrade ROS? Ubuntu? Somehow tell ROS where my openCV libraries are? Thanks for any help!

Update: I was able to get ar_tools to compile correctly in ROS melodic using Ubuntu 18.04 LTS with WSL2. Not sure why this wasn't working in Noetic, maybe OpenCV has been updated?

c++opencvubunturoscatkin


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