configure: error: libpng.(a|so) not found.

rpm -qa | grep libpng
libpng-1.2.7-1.el4.2
libpng-1.2.7-1.el4.2
libpng10-1.0.16-1
libpng10-1.0.16-1
libpng-devel-1.2.7-1.el4.2
libpng10-devel-1.0.16-1