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Bad news: it is not about simply ordering the libs...
I also use OpenCV for Android with Qt 5.12.3 and also couldn't make the application link. I couldn't find a way to make any prebuilt OpenCV version to work (I tried many variations of all the relevant components) and finally I understood and accepted that with v. 4 one needs to use shared libraries, that is, use .so files, not .a, and a version of OpenCV that is built for the NDK version used (which would be v. 19 for 5.12.3).
That meant self-building OpenCV. Luckily, there were recipes for that. If I remember correctly, I did it like here: https://www.tal.org/tutorials/build_opencv_qt_android
(Of course the commands need "some" tailoring depending on any particular development system organization.)
