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