php5-mysql ports error!

[hlddn]

configure: error: mysql configure failed. Please check config.log for more
information.
===> Script "configure" failed unexpectedly.
Please report the problem to ale at FreeBSD.org [maintainer] and attach the
"/usr/ports/databases/php5-mysql/work/php-5.1.4/ext/mysql/config.log"
including
the output of the failure of your make command. Also, it might be a good
idea
to provide an overview of all packages installed on your system (e.g. an `ls

/var/db/pkg`).
*** Error code 1

ports is fresh，mysql-server-5.0.22，mysql-client-5.0.22 all installed also。

uname -a：
FreeBSD www.leshou.com 6.1-RELEASE-p2 FreeBSD 6.1-RELEASE-p2 #1: Wed Jun 21
02:13:48 CST 2006 root at www.leshou.com:/usr/obj/usr/src/sys/LESHOU i386