1 This demonstrates the use of PNG_USER_CONFIG, pngusr.h and pngusr.dfa
3 The makefile builds a minimal read-only decoder with embedded libpng
6 Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
7 on the make command line.
9 If you prefer to use the shared libraries, go to contrib/pngminus
10 and build the png2pnm application there.