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If a zlib source tree exists besides the libpng source tree in the same parent directory, the pngminus build may fail, unless the zlib tree is built fully. In order to avoid this failing scenario, do not use the custom-built zlib by default. (The custom-built zlib is still necessary on platforms that lack a system-built zlib.)
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".