Thank you for taking the time to report a problem with PHP.
Unfortunately you are not using a current version of PHP -- 
the problem might already be fixed. Please download a new
PHP version from http://www.php.net/downloads.php

If you are able to reproduce the bug with one of the latest
versions of PHP, please change the PHP version on this bug report
to the version you tested and change the status back to "Open".
Again, thank you for your continued support of PHP.

And make sure your installed mysql headers match the installed libraries. Which seems to be reason for this compile failure anyway.

i already use php 5.0.5 the new version and i loaded 4 mysql rpm packages namely:
 MySQL-client-4.1.14-0.i386.rpm
MySQL-devel-4.1.14-0.i386.rpm for header files as you suggested
MySQL-server-4.1.14-0.i386.rpm
MySQL-shared-4.1.14-0.i386.rpm

using rpm -Uvh
here's next what i did

cd to php-5.0.5 and follow the isntruction in php manual
in installing apache 2 on unix systems with php5.0.5 as follows

./configure --with-apxs2=/usr/local/apache2/bin/apxs --with-mysql

the result is:

----- some codes here

ext/mysql/php_mysql.lo(.text+0x2076): In function `zif_mysql_create_db':
/home/php/php-5.0.5/ext/mysql/php_mysql.c:1169: undefined reference to `mysql_create_db'
ext/mysql/php_mysql.lo(.text+0x2279): In function `zif_mysql_drop_db':
/home/php/php-5.0.5/ext/mysql/php_mysql.c:1211: undefined reference to `mysql_drop_db'
collect2: ld returned 1 exit status
make: *** [sapi/cli/php] Error 1

I'm sorry but this can't be bug in PHP. There is some stale mysql header file somewhere along the include path which has MYSQL_VERSION_ID < 40000.

Thank you for the quick response and for the information.
God Bless!