You are missing libz (which is strange, since libpng depends on libz)
Oops, sorry. We fixed the problem. Somehow libpng got built without linking to zlib. Odd. Many thanks for your help. Austin -- Austin Acton Hon.B.Sc. Synthetic Organic Chemist, Teaching Assistant Department of Chemistry, York University, Toronto MandrakeClub Volunteer (www.mandrakeclub.com) homepage: www.groundstate.ca