| 123456789101112131415 | This demonstrates the use of PNG_USER_CONFIG and pngusr.hThe makefile builds a minimal read-only progressive decoder withembedded libpng, zlib and your system's X library.Specify the location of the zlib source (1.2.1 or later) as ZLIBSRCon the make command line.Edit makefile if required, to find your X library and include files,then    make ZLIBSRC=directoryIf you prefer to use the shared libraries, go to contrib/gregbookand build the rpng2-x application there.
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