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
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