PHP 5.2.5 make failure gdImagePngCtxEx undeclared

["Bart McPherson" <b.mcpherson@xxxxxxxxxxx>]

I'm trying to make PHP 5.2.5 on AIX 5.3 and having a problem during make.

I get the following when running make.
 /bin/sh 
/usr/local/php-5.2.5/libtool --silent --preserve-dup-deps --mode=compile 
/usr/local/php-5.2.5/meta_ccld -I/opt/freeware/include -Iext/gd/ -I/usr/local/php-5.2.5/ext/gd/ 
 -DPHP_ATOM_INC -I/usr/local/php-5.2.5/include -I/usr/local/php-5.2.5/main -I/usr/local/php-5.2.5 
 -I/usr/local/WebServer/plugins/include -I/opt/freeware/include/libxml2 -I/opt/freeware/include 
 -I/usr/local/php-5.2.5/ext/date/lib -I/opt/freeware/include/freetype2 -I/usr/local/mysql/include 
 -I/usr/local/php-5.2.5/TSRM -I/usr/local/php-5.2.5/Zend  -D_THREAD_SAFE  -I/usr/include 
 -g -O2 -pthread -DZTS   -c /usr/local/php-5.2.5/ext/gd/gd.c -o ext/gd/gd.lo
/usr/local/php-5.2.5/ext/gd/gd.c: In function 'zif_imagepng':
/usr/local/php-5.2.5/ext/gd/gd.c:2977: error: 'gdImagePngCtxEx' undeclared 
(first use in this function)
/usr/local/php-5.2.5/ext/gd/gd.c:2977: error: (Each undeclared identifier is 
reported only once
/usr/local/php-5.2.5/ext/gd/gd.c:2977: error: for each function it appears 
in.)
make: 1254-004 The error code from the last command is 1.

This is the configure used.
./configure \
--with-nsapi=/usr/local/WebServer \
--with-openssl=/opt/freeware \
--with-mysql=/usr/local/mysql \
--enable-force-cgi-redirect \
--with-gettext \
--with-libxml-dir=/opt/freeware/lib \
--with-gd=/opt/freeware \
--enable-gd-native-ttf \
--with-jpeg-dir=/opt/freeware \
--with-png-dir=/opt/freeware \
--with-freetype-dir=/opt/freeware \
--with-zlib-dir=/opt/freeware

Any thoughts on what to check?
Thanks,
Bart