OT: Webalizer and png library

[Budi Febrianto]

Sorry if this question is not belong to the list.
Server RHL 8.0
Webalizer 2.01-10

I think I have all the necessary library for it.
libpng-1.2.5-3
zlib-1.1.4-4
gd-1.8.4-9

But everytime I try to compile webalizer from source, always reported this
error:
configure: error: png library not found... please install png.

I also run mrtg in my system to monitor cisco router. I think mrtg and
webalizer is use the same library.
Maybe I think to much... :)