I'm running a C++ program using OpenCV. I've installed all necessary libraries but it seems cmake cannot find OpenCV libraries.
The command port content opencv3 shows my opencv libraries are under these folders:
/opt/local/libexec/
/opt/local/bin/
/opt/local/lib/
/opt/local/include/
but adding set(OpenCV_DIR /opt/local) before find_package(OpenCV REQUIRED) didn't work and the same error just pop up every time.
What should I do?
CMake commands do not separate their arguments via ,. Thus when you wrote:
set(OpenCV_DIR, /opt/local/share/OpenCV)
You in fact set a variable named OpenCV_DIR, to /opt/local/share/OpenCV. You can "fix" it by removing the comma:
set(OpenCV_DIR /opt/local/share/OpenCV)
I say "fix" because this is not a good way of doing things. Your CMakeLists.txt should be free of absolute paths. Instead, set -DCMAKE_PREFIX_PATH=/opt/local on the command line or in a preset.
locate is using some old cache and nothing really exists in the folder I mentioned in my previous question. I've just updated my question and please help me out. The program was able to run a few days ago before I upgraded the macOS system to a newer version, I've tried to reinstall the environment but it's always the same problem.
OpenCVConfig.cmake file on your system? Without that file (or opencv-config.cmake one) OpenCV cannot be detected by CMake.OpenCVConfig.cmake is /opt/local/libexec/openvc3/cmake, and set(OpenCV_DIR /opt/local/libexec/openvc3/cmake) worked. I'd like to follow your advice, but I only have some experience with python and am really a noob with C++. I'm using CLion as my IDE and how can I set -DCMAKE_PREFIX_PATH=/opt/local on the command line as your recommendation? Thanks.
set(OpenCV_DIR /opt/local).set(OpenCV_ROOT /opt/local), maybe.