Compile OpenCV4

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Since OpenCV4 does not generata .pc file by default, we need to compile it from source and turn ont the OPENCV_GENERATE_PKGCONFIG option if other programs need the pkg-config file.

Another problem I encountered is a number of errors similar to undefined reference to TIFFReadRGBAStrip@LIBTIFF_4.0. To solve that, the BUILD_TIFF option needs to be turned on.

And following is the script for compilation and installation.

cd opencv-4.1.0
mkdir build && cd build
sudo make -j`nproc`
sudo make install
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