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I've solved this issue.
By analyzing the program with ldd, I found that it was linked to, for example, /usr/lib/libopencv_highgui.so. However, in x86_64 system, it should be /usr/lib/x86_64-linux-gnu/libopencv_highgui.so. In my system, both files were installed.
The issue was caused by /usr/lib/libopencv_*.so (I'm not sure how I installed them. Maybe from source code...?). I removed these files, and compiled the above program again. Then it worked without errors.
