PHP configure png.h problem with GD

[Sacha Ligthert <Sacha@Ligthert.net>]

Hi List,

I've looked through google and mailinglist arcives, but coudn't find a 
solution to my problem.
http://marc.theaimsgroup.com/?l=openbsd-misc&m=105916925819344&w=2
describes a similar problem but with a different cause. (His being an 
unpatched configure, fixed by now in 4.3.4 (assuming))

I try to compile PHP 4.3.4 with the folowing configure string:
./configure --with-mysql --with-apxs --with-openssl --with-mcrypt 
--with-imap --enable-track-vars --enable-force-cgi-redirect 
--with-gettext --with-ldap --with-gd --with-jpeg-dir=/usr/local/lib/ 
--enable-gd-native-ttf --with-zlib-dir=/usr/lib/ --with-png 
--with-png-dir=/usr/local/lib/

This results with the following error:
"configure: error: png.h not found."
  (I've searched with google with no relevant result)

I am trying to compile:
PHP 4.3.4 with GD 1.8.3, png-1.2.5p1 and jpeg-6b

My question: Does anybody know how to resolve this issues?

Greetings,

Sacha Ligthert

PS: I tried installing PHP4 from packages with extra plug-in's/Featurs 
like imap,mysql and GD.. But MySQL seemed to have disappeared then on my 
install.
Thats why I've decided to get back to source installs.