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Can OpenCV2 and OpenCV3 be installed togheter?

I have OpenCV 2.4.11 and now I am porting some of my codes to OpenCV3, in the meanwhile I still have to do work on 2.4.11. So I have been installing and uninstalling, going back and forth between 2.4.11 and 3. Is there a way to have both installed and select which one to use? e.g. at compilation time?, that will help me a lot. What has to be done? How to select them?