ftp.nice.ch/pub/next/graphics/viewer/ToyViewer.2.6a.s.tar.gz#/ToyViewer2.6a/src/lib

png.h
[View png.h] 

pngconf.h
[View pngconf.h] 

zconf.h
[View zconf.h] 

zlib.h
[View zlib.h] 

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.