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This demonstrates the use of PNG_USER_CONFIG and pngusr.h
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To build a minimal read-only progressive decoder embedded libpng and
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zlib and with your system's X library, run
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gather.sh # to collect needed files from gregbook, libpng, and zlib
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Edit makefile if required, to find your X library and include files,
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If you prefer to use the shared libraries, go to contrib/gregbook
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and build the rpng2-x application there.