Well, 

im running a redhat 7.1 server, with :

apache 1.3.20
php 4.0.6
libpng 1.2.0
jpeg6b


and when i configure the php lib with the following options :

./configure --with-apxs=/usr/local/apache/bin/apxs --enable-versioning --with-mysql=/usr/local/mysql --enable-track-vars --enable-sockets --enable-ftp --with-xml --with-zlib --with-gettext --with-gd=../gd-1.8.4 --with-swf --with-jpeg-dir=/usr/lib --with-png-dir=../libpng-1.2.0/ --with-openssl --with-freetype-dir=../freetype-2.0.4/ --with-zlib-dir=../zlib-1.1.3 |more|grep gd

and i get the following output :

checking whether to enable truetype string function in gd... no
checking for gdImageString16 in -lgd... (cached) yes
checking for gdImagePaletteCopy in -lgd... (cached) yes
checking for gdImageCreateFromPng in -lgd... (cached) no
checking for gdImageCreateFromGif in -lgd... (cached) no
checking for gdImageWBMP in -lgd... (cached) yes
checking for gdImageCreateFromJpeg in -lgd... (cached) no
checking for gdImageCreateFromXpm in -lgd... (cached) yes
checking for gdImageCreateTrueColor in -lgd... (cached) no
checking for gdImageSetTile in -lgd... (cached) yes
checking for gdImageSetBrush in -lgd... (cached) yes
checking for gdImageStringFTEx in -lgd... (cached) no
checking for gdImageColorClosestHWB in -lgd... (cached) yes
checking for gdImageColorResolve in -lgd... (cached) yes
checking for gdImageGifCtx in -lgd... (cached) no

And we do need the checking for gdImageCreateFromPng in -lgd... (cached) no => yes =/


if you've got any idea go on ! i ve been working on it since 1 week 6 hours a day !

we DO need this lib to be working =]