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This path was retained for compatibility with 2.4. Please, take a look at the Transition Guide for some details about compatibility. It is not 100%, but many simple programs should not need too many changes.

The __-DINSTALL_TO_MANGLED_PATHS=ON__ cmake option allows to install several versions on the same machine. With this option:

• headers will be put to <install-root>/include/opencv-3.0.0-dev/opencv2 folder
• pkg-config configuration file will be named <install-root>/lib/pkgconfig/opencv-3.0.0-dev.pc
• cmake configuration file put into <install-root>/share/OpenCV-3.0.0-dev folder

This path was retained for compatibility with 2.4. Please, take a look at the Transition Guide for some details about compatibility. It is not 100%, but many simple programs should not need too many changes.

The __-DINSTALL_TO_MANGLED_PATHS=ON__ -DINSTALL_TO_MANGLED_PATHS=ON cmake option allows to install several versions on the same machine. With this option:

• headers will be put to <install-root>/include/opencv-3.0.0-dev/opencv2 folder
• pkg-config configuration file will be named <install-root>/lib/pkgconfig/opencv-3.0.0-dev.pc
• cmake configuration file put into <install-root>/share/OpenCV-3.0.0-dev folder