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I knew this question has answers.Eventhough I tried different websites to install after performing installation to ensure the opencv version and library path,I compiled pkg-config... and pkg cflags... command,but console display as, ////Package opencv was not found in the pkg-config search path. Perhaps you should add the directory containing `opencv.pc' to the PKG_CONFIG_PATH environment variable No package 'opencv' found//// I need simple and easy steps with clear to install opencv4 in c++ IF anyone know guide me to install this one.