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c993ae4c67
Raise the minimum required CMake version to 3.5. Add the configuration option `PNGMINUS_USE_SYSTEM_PNG` for compiling and linking with the system libpng library instead of the internal one. Remove the old configuration option `PNGMINUS_USE_STATIC_LIBRARIES`. When using the internal libpng (via `PNGMINUS_USE_SYSTEM_PNG=OFF`), simply enforce static linking and produce single-file executables. Rename the scripts "png2pnm.sh" (etc.) to "test_png2pnm.sh" (etc.), to make it obvious that they are test drivers, not program launchers. Add a .gitignore file for project-specific build and test artifacts.
This "contrib" directory contains contributions which are not necessarily under the libpng license, although all are open source. They are not part of libpng proper and are not used for building the library, although some are used for testing the library via "make check".