Cmake: OpenCV > 2.4.3 not found. , but via pip: opencv-contrib-python (3.4.0.12) is installed

[bubbelMCU]

hello, not sure what shall I do?
cmake cannot find opencv, which I installed for python2 and 3 via pip and the version is:
opencv-contrib-python (3.4.0.12)

How to set path to opencv pip package correctly?
Or do I need to recompile opencv from source?

Error message by Cmake:

-- Using flag -std=c++11.
CMake Error at CMakeLists.txt:35 (message):
  OpenCV > 2.4.3 not found.

[douxiao]

https://blog.csdn.net/gxsheen/article/details/79090454

[ishanivyas]

Having same issue with OpenCV > 2.4.3 not found.

[LongruiDong]

https://blog.csdn.net/gxsheen/article/details/79090454

It WORKS!!!

[Brian-ZhenLiu]

https://blog.csdn.net/gxsheen/article/details/79090454

This really works.

[Wingmore]

Could someone provide/explain the steps from the blog please? I don't understand and I've searched every other answer on the web

[Wingmore]

nvm, I got it - had to add my openCV directory to Thirdparty/DBoW2/CMakeLists.txt

i.e. had to find my openCV directory. For me it was in /usr/local/include/opencv4.
Then I just added SET (OpenCV_DIR /usr/local/include/opencv4) to my CMakeLists.txt file.

[ratomatrix]

Same error message for me in January 2021.
In my case, the issue was that I just installed the latest OpenCV (as of January 2021 - OpenCV 4.5.1), but versions above OpenCV 3 are not accepted. So I downloaded and installed the latest version starting with 3 (3.4.13), and this error message has gone.
(Unfortunately, I personally have other error messages now :) But at least this one seems to be solved.)

[Emilianocb]

nvm, I got it - had to add my openCV directory to Thirdparty/DBoW2/CMakeLists.txt

i.e. had to find my openCV directory. For me it was in /usr/local/include/opencv4. Then I just added SET (OpenCV_DIR /usr/local/include/opencv4) to my CMakeLists.txt file.

i can't added 'SET (OpenCV_DIR /usr/local/include/opencv4)' because the file are only to read, I tried with chmod but it's the same

[DANIELHARDLY]

nvm, I got it - had to add my openCV directory to Thirdparty/DBoW2/CMakeLists.txt
i.e. had to find my openCV directory. For me it was in /usr/local/include/opencv4. Then I just added SET (OpenCV_DIR /usr/local/include/opencv4) to my CMakeLists.txt file.

i can't added 'SET (OpenCV_DIR /usr/local/include/opencv4)' because the file are only to read, I tried with chmod but it's the same

use sudo to edit CMakeLists.txt
if you are using vim type sudo vim CMakeLists.txt

[mgrallos]

SET (OpenCV_DIR /usr/local/include/opencv4)
where do I put it? I did already add it but same error occurs