I have a project in which I manage most dependencies by tracking them with git submodules and then, where possible, adding them to a CMake build with `add_subdirectory`. I am having trouble getting this to work with opencv because the include headers seem to be in the wrong spot until OpenCV is actually installed. The targets (e.g. `opencv_core`, `opencv_imgproc`) are available to link, but these targets seem not to export the expected build-time include directories.
I get the sense that my approach with git submodules and cmake subdirectories is not the way OpenCV expects this to go. Is there a best practice for linking/installing a custom OpenCV build in the context of a larger project via CMake?
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