How to enable PNG support ?

Hi I'm upgrading PHP from version 4.0.1 to 4.1.2. On 4.0.1, PNG support is enabled :-) Using the same config.nice batch job, on 4.1.2, PNG support is disabled. :-( Can someone kindly give me a hint how to enable the PNG support ??? Thank you in advance. Here the phpino message I get calling a script with the 4.1.2 build: gd GD Support enabled GD Version 1.6.2 or higher FreeType Support enabled FreeType Linkage with TTF library WBMP Support enabled zlib ZLib Support enabled 'zlib:' fopen wrapper enabled Compiled Version 1.1.3 Linked Version 1.1.3 Calling Image-PNG-functions, the script says: No PNG support in this PHP build. Here's the config.nice job: #! /bin/sh './configure' \ '--enable-track-vars' \ '--enable-magic-quotes' \ '--with-mysql' \ '--enable-tran--enable-calendar' \ '--with-gd' \ '--with-png-dir=/usr/lib' \ '--with-zlib-dir=/usr/lib' \ '--with-ttf=yes' \ "$@" I tried this job with and without --with-png-dir and --with-zlib-dir options. Thank you again in advance, cheers Peter