#cd php-5.3.6/ext/mysqli 
#/usr/local/webserver/php/bin/phpize 
#./configure --with-php-config=/usr/local/webserver/php/bin/php-config 
#make 
#make instal 

checking for MySQLi support... yes
checking whether to enable embedded MySQLi support... no
mysql_config not found
configure: error: Please reinstall the mysql distribution

#./configure --with-php-config=/usr/local/webserver/php/bin/php-config --with-mysqli=/usr/local/mysql/bin/mysql_config 

extension=mysqli.so