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First, you need to find where 'OpenCVConfig.cmake' is, using following command:

locate OpenCVConfig.cmake

And then you just need to add the following command before 'find_package'.

set(OpenCV_DIR path_include_OpenCVConfig.cmake)

First, you need to find where 'OpenCVConfig.cmake' is, using following command:

locate OpenCVConfig.cmake

And then you just need to add the following command before 'find_package'.

set(OpenCV_DIR path_include_OpenCVConfig.cmake)

For example,

set(OpenCV_DIR /usr/local/lib/cmake/opencv4)
find_package(OpenCV 4.0.0 REQUIRED)

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