Blame thirdparty/libpng-1.6.21/contrib/pngminim/encoder/README
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This demonstrates the use of PNG_USER_CONFIG and pngusr.h
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The makefile builds a minimal write-only encoder with embedded libpng
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and zlib.
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Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
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on the make command line.
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If you prefer to use the shared libraries, go to contrib/pngminus
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and build the pnm2png application there.
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