/usr/bin/ld: cannot find -lEigen3::Eigen collect2: error: ld returned 1 exit status

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https://eigen.tuxfamily.org/index.php?title=Main_Page

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https://qiita.com/okubo999/items/6c8b001e79376f594ea3

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$ wget http://bitbucket.org/eigen/eigen/get/3.3.4.tar.gz URL transformed to HTTPS due to an HSTS policy --2022-05-09 11:52:12-- https://bitbucket.org/eigen/eigen/get/3.3.4.tar.gz Resolving bitbucket.org (bitbucket.org)... 2406:da00:ff00::22e9:9f55, 2406:da00:ff00::22c5:2ef4, 2406:da00:ff00::22c0:3470, ... Connecting to bitbucket.org (bitbucket.org)|2406:da00:ff00::22e9:9f55|:443... connected. HTTP request sent, awaiting response... 404 Not Found 2022-05-09 11:52:13 ERROR 404: Not Found.

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https://github.com/FloopCZ/tensorflow_cc/issues/192

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wget https://gitlab.com/libeigen/eigen/-/archive/3.3.7/eigen-3.3.7.tar.gz gitlabから取得できた

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https://gitlab.com/libeigen/eigen

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https://github.com/raulmur/ORB_SLAM2/issues/1015#issuecomment-912593195

I solve it. I found Pangolin has a upgrade to version 0.6 and the author make it to comply with c++ 17 or something. but orbslam2 reconment to c++ 11.
a higher version Pangolin is not suitble even it is installed.
1st, check the /usr/local/include. is there a signals derectory? if yes, delete it.
2ed, remove Pangolin files and clone 0.5 version codes.
3rd, rebuild it and install it.
to end, build orbslam2 (I was using build.sh).
hope it can help.

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Pangolin
git checkout v0.5

sudo apt-get install libglew-dev
sudo apt-get install cmake
sudo apt-get install libpython2.7-dev
sudo apt-get install ffmpeg libavcodec-dev libavutil-dev libavformat-dev libswscale-dev
sudo apt-get install libdc1394-22-dev libraw1394-dev
sudo apt-get install libjpeg-dev libpng12-dev libtiff5-dev libopenexr-dev

mkdir ~/pangolin_ws
cd ~/pangolin_ws
git clone https://github.com/stevenlovegrove/Pangolin.git
cd Pangolin
mkdir build
cd build
cmake ..
make -j
sudo make install

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上記で実行できた