运行phpize时出现：Cannot find autoconf. Please check your autoconf installation
运行/usr/local/webserver/php/bin/phpize时出现：
Configuring for:
PHP Api Version:         20041225
Zend Module Api No:      20060613
Zend Extension Api No:   220060519
Cannot find autoconf. Please check your autoconf installation and the
$PHP_AUTOCONF environment variable. Then, rerun this script.
根据网上的解决办法是：

 yum install m4

 yum install autoconf

php的GD扩展支持 http://jimingsong.iteye.com/blog/1181654