No rule to make target '/usr/lib/aarch64-linux-gnu/libopencv_objdetect.so.3.2.0' about depthimage_to_laserscan HOT 4 CLOSED

Commenting just to post the solution I found in AprilRobotics/apriltag_ros#66 (comment) for the exact same issue

sudo apt install libopencv3.2

This installs the missing libraries, including libopencv_objdetect.so.3.2.0.

from depthimage_to_laserscan.

I try to run this sudo apt-get install ros-melodic-depthimage-to-laserscanto solve the issue,but I still get the error.I don't find libopencv_objdetect.so.3.2.0 under the file /usr/lib/aarch64-linux-gnu/,I guess it will be fixed by copying libopencv_objdetect.so.3.2.0 to /usr/lib/aarch64-linux-gnu/.Who can show me the libopencv_objdetect.so.3.2.0,I will very appreciate it,thanks.

from depthimage_to_laserscan.

you need again Compile Opencv 3.2.0:
cmake ..
make
sudo make install

from depthimage_to_laserscan.

Yes, @haosen9527 generally has it right. Usually this means that OpenCV wasn't installed correctly.

As an FYI, on Ubuntu 18.04, you need to have the package libopencv-objdetect3.2 installed for this to work.

I'm going to close this out, but feel free to keep commenting or re-open if you still are having problems.

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