No rule to make target error about apriltag_ros HOT 7 CLOSED

I resolved the same problem on my x86 ubuntu bionic desktop by running

sudo apt install libopencv3.2

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I think catkin build doesn't work because the core AprilTag library is not a ROS component and is pure C/C++. You have to use catkin_make_isolated and maybe this will solve the problem.

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@parakhm95 catkin build does work - it's a ThirdParty released project with a package.xml so does work. The issue above appears to be from not running rosdep install --from-paths ./ -iry to install required dependencies.

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Closing - please reopen if problem persists.

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won't it work with opencv 4.1?

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as @AndreV84 said, still not working with opencv 4.1.

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However, in case of use of the following it will work with in-build opencv 3.2 that comes with apt package, in my opinion

apt install ros-melodic-apriltag-ros

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