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OpenCV 4 Not compatible OpenCV 3

Dear all,

I just finished to download and compiled OpenCV 4. I've got a lot of errors, essentially using "old" OpenCV version program like 3.2. I received this kind of message:

undefined reference « cv::String::allocate(unsigned long) »

Could you please explain me why ?

What do I need to do to solve those issues ?

Thanks for your help and support.