Could not find module FindOpenCV.cmake ( Error in configuration process)

Question

I wrote a CMakeLists.txt for a project in C++, which uses OpenCV libraries. When I try to create the project using cmake, I get the next configuration problem:

CMake Error at CMakeLists.txt:15 (find_package):   Could not find module FindOpenCV.cmake or a configuration file for package   OpenCV.    Adjust CMAKE_MODULE_PATH to find FindOpenCV.cmake or set OpenCV_DIR to the   directory containing a CMake configuration file for OpenCV.  The file will   have one of the following names:      OpenCVConfig.cmake     opencv-config.cmake 

The fact is that I have an environment variable for the path which I use in Visual Studio with no problems. If I don't include OpenCV, then I can configure and generate with no problem, but I need to solve the problem. I don't understand why cmake cannot find the OpenCV path or how to fix it.

I also used the recommendations mentioned in this link: FindOpenCV.cmake

Does anybody had this problem too?

Answer 1

The error you're seeing is that CMake cannot find a FindOpenCV.cmake file, because cmake doesn't include one out of the box. Therefore you need to find one and put it where cmake can find it:

You can find a good start here. If you're feeling adventurous you can also write your own.

Then add it somewhere in your project and adjust CMAKE_MODULE_PATH so that cmake can find it.

e.g., if you have

CMakeLists.txt cmake-modules/FindOpenCV.cmake 

Then you should do a

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake-modules) 

In your CMakeLists.txt file before you do a find_package(OpenCV)