CentOS - Dec 2010 - Installing GDChart fails: pecl/gdchart requires PHP extension "gd"

Hello,

has anybody solved the problem of installing GDChart on CentOS 5.5
(I've tried both 32 and 64 bit versions)?

I have:

# rpm -qa | grep -i php
php-pear-1.4.9-6.el5
php-gd-5.1.6-27.el5
php-ldap-5.1.6-27.el5
php-pgsql-5.1.6-27.el5
php-5.1.6-27.el5
php-pdo-5.1.6-27.el5
php-common-5.1.6-27.el5
php-cli-5.1.6-27.el5
php-devel-5.1.6-27.el5

And the "pecl" seems to find GDChart in its repository:

#  sudo pecl search GDChart
Retrieving data...0%....50%....Matched packages, channel pecl.php.net:
======================================Package Stable/(Latest)    Local
GDChart -n/a-/(0.2.0 beta)       GDChart Based Graphing Interface

But installing it fails:

# sudo pecl install GDChart
Failed to download pecl/GDChart within preferred state "stable",
latest release is version 0.2.0, stability "beta", use
"channel://pecl.php.net/GDChart-0.2.0" to install
Cannot initialize 'GDChart', invalid or missing package file
Package "GDChart" is not valid
install failed

Ok, then I try the suggested "URL":

# sudo pecl install "channel://pecl.php.net/GDChart-0.2.0"
pecl/gdchart requires PHP extension "gd"
No valid packages found
install failed

But I do have both "gd" and "php-gd" rpms installed and
enabled:

# cat /etc/php.d/gd.ini
; Enable gd extension module
extension=gd.so

Any suggestions please?
Alex