b458f4ef6bef06069ff2e2e1d78037a0e0c23a39
if only "png" is used, then on some systems with other png versions (me), the linker will link with to the wrong path (/usr/local/lib/libpng14.14.dylib in my case). if you don't like the version number (I don't know so I put 1.5.1sm0.1) please change it to something else, just keep it unique.
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