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Always awkward to answer your own question but still found the info I was missing, maybe of use, on following page: Building Java Wrapper For OpenCV

If I have managed to build my libopencv_java4.so file, it seems it doesn't link properly at runtime with message like:

java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "fread_unlocked" referenced by ... /lib/arm64/libopencv_java4.so

Which I have no real clue how to debug, if anyone has, would be great!