Why I cannot build my own program in Cygwin when using libpng function????

[Charles Wilson]

valpassing wrote:
> I installed libpng in cygwin. then I include png.h in my files, and
> use many fucntions provided by libpng.
> But when I compile it, it reports:
> 
> xiaodwan@xiaodwan-wxp ~/Desktop//pix
> $ gcc -lpng12 -lz -I/usr/include/libpng12 -o ref ref.c


try

gcc -I/usr/include/libpng12 -o ref ref.c -lpng12 -lz

gcc searches from left to right. If ref.c uses symbols provided by 
libpng, then libpng must appear *after* ref.c on the command line.

--
Chuck




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