[CentOS] installation needs libpng but rpm is there

Hi 

I got an error

configure: error: png library not found. please install libpng

but I check rpm is installed

libpng-1.2.10-7.1.el5_0.1

How can I do?

Thank you



      __________________________________________________________________
Yahoo! Canada Toolbar: Search from anywhere on the web, and bookmark your favourite sites. Download it now at
http://ca.toolbar.yahoo.com.