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To make sure that you use Qt, you have to pass the option in your cmake call. You can use ccmake to have a visual interface inside your term in rider to check all the settings.
These symbols come from the ffmpeg libs. You can install them with e.g. homebrew (among all the methods I have tested to install them it's by far the easiest one). Note however that 2.4.3 introduced a regression for me at this point: highgui is asking at runtime for a specific version of the ffmpeg libs which is not the latest one provided by homebrew.
Hope this helps !
