Description:
------------
During a round of Upgrades yesterday I attempted to build php 5.1.3 against my newly upgraded (from 5.0.16 to 5.0.21) MYSQL install.  I get a configure error. I was previously able to configure and build against 5.0.16.

I reextracted the PHP 5.1.3 source (in a new directory) just to be sure everything was clean, that didn't fix anything.

Config line:
'./configure' '--with-apxs2=/net-services/apache22/bin/apxs' '--with-mysql=/net-services/mysql-max-5.0.21-linux-i686' '--with-gd' '--with-zlib-dir=/usr/lib' '--with-imap=/usr/lib/imap-2002e' '--with-mysqli=/net-services/mysql-max-5.0.21-linux-i686/bin/mysql_config' '--enable-mbstring'

Reproduce code:
---------------
Error:
checking for MySQL support... yes
checking for specified location of the MySQL UNIX socket... no
checking for MySQL UNIX socket location... no
checking for mysql_close in -lmysqlclient... no
checking for mysql_error in -lmysqlclient... no
configure: error: mysql configure failed. Please check config.log for more information.



Expected result:
----------------
Clip from Bottom of config.log:
#line 58779 "configure"
#include "confdefs.h"
/* Override any gcc2 internal prototype to avoid an error.  */
/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char mysql_error();

int main() {
mysql_error()
; return 0; }