"fatal error: Eigen/Core: No such file or directory" while installing OpenCV on Ubuntu

Question

I'm installing opencv for Python in Ubuntu 18.04 LTS from the official OpenCV release here https://docs.opencv.org/4.1.0/d2/de6/tutorial_py_setup_in_ubuntu.html

after creating the build directory and entering cmake ../ the moment I enter the command to make it's giving me the following error - Previously I've used OpenCV on Windows. I'm new in Ubuntu. Please help.

In file included from /home/avi/opencv/modules/core/test/test_precomp.hpp:12:0,
                 from /home/avi/opencv/build/modules/core/opencv_test_core_pch_dephelp.cxx:1:
/home/avi/opencv/modules/core/include/opencv2/core/private.hpp:66:12: fatal error: Eigen/Core: No such file or directory
 #  include <Eigen/Core>
            ^~~~~~~~~~~~
compilation terminated.
modules/core/CMakeFiles/opencv_test_core_pch_dephelp.dir/build.make:62: recipe for target 'modules/core/CMakeFiles/opencv_test_core_pch_dephelp.dir/opencv_test_core_pch_dephelp.cxx.o' failed
make[2]: *** [modules/core/CMakeFiles/opencv_test_core_pch_dephelp.dir/opencv_test_core_pch_dephelp.cxx.o] Error 1
CMakeFiles/Makefile2:1287: recipe for target 'modules/core/CMakeFiles/opencv_test_core_pch_dephelp.dir/all' failed
make[1]: *** [modules/core/CMakeFiles/opencv_test_core_pch_dephelp.dir/all] Error 2
Makefile:162: recipe for target 'all' failed
make: *** [all] Error 2

leandro souza rosa · Accepted Answer · 2021-06-14 08:36:32Z

4

Seems like OpenCV did not find Eigen where it was expecting. Supposing you installed Eigen:

sudo apt-get install libeigen3-dev

The most correct way would be for you to specify to OpenCV where you installed Eigen by setting the variable EIGEN_INCLUDE_PATH, usually to \usr\include, but check your system.

Another option, instead of editing the OpenCV code, is to create some links between where you installed Eigen, and where OpenCV expects it to be:

cd /usr/include
sudo ln -sf eigen3/Eigen Eigen
sudo ln -sf eigen3/unsupported unsupported

answered Jun 14, 2021 at 8:36

leandro souza rosa

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SuperPomax · Accepted Answer · 2021-06-15 17:11:57Z

3

I didn't find the solution for me in this post so I may as well share it if somebody comes by.

Problem : The include was looking for an include called Eigen while I installed Eigen3.

Solution : Create a soft link to create a directory called Eigen that redirect to Eigen3.

sudo ln -s /usr/include/eigen3/Eigen /usr/include/Eigen

https://www.programmersought.com/article/44372970691/

answered Jun 15, 2021 at 17:11

SuperPomax

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Anubhav Singh · Accepted Answer · 2019-07-21 15:38:08Z

2

Go to /home/avi/opencv/modules/core/include/opencv2/core/private.hpp file.

Edit the line: # include <Eigen/Core> to # include <eigen3/Eigen/Core>

1 Comment

Avirup Aditya Over a year ago

Thanks. I actually had to resolve it by uninstalling all the dependencies and installing again. It worked!

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