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#include <opencv2/imgproc/imgproc.hpp>

(and of course you need to link against imgproc as well, but I guess you are doing that already)

You write:

I initially thought it was the include library problem, but apparently it's not. Any idea anybody?

However,

#include <opencv2/imgproc/imgproc.hpp>

(and of course is missing. (Additionally, you need to link against imgproc as well, but I guess you are doing that already)