I am using Mac and already installed a computer vision library, OpenCV 3 for my computer (system-wide) and it is compiled with support for Python 2 interpreter. I am now, want to build another OpenCV 3 library, reusing that same git clone of OpenCV, that will be compiled for the Python 3 interpreter. I want to build/install it locally. Before I do anything, I want to confirm if my step would be right since I want to prevent any file tanglation.
1. It is said that I have to delete the `CMakeCache.txt` file inside the `build` folder of my previous build in order to build the new OpenCV. Is it true? I mean, my previous `build` folder (for Python 2) is inside the repo folder such that `~/opencv/build`, but shouldn't it be just fine?
2. I know I have to set up the flag `CMAKE_INSTALL_PREFIX` to somewhere else, but as long as I do not `make install`, it should be just fine, isn't? Since I believe that flag is just to set up the make install target.
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