[CentOS] php still without mysql installing php-mysql

Am using php 5.1.6 and mysql 5.0.27 I installed php-mysql 5.1.6 from the
centos repositories, I then restarted the server and on running phpinfo it
still shows that mysql is not configured with php (--without-mysql), what
might be wrong. The same happened after I installed php-gd too
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