Cannot find autoconf. Please check your autoconf installation

运行/usr/local/webserver/php/bin/phpize时出现：
[root@example.com xcache-3.2.0]# /usr/local/php/bin/phpize
Configuring for:
PHP Api Version:         20131106
Zend Module Api No:      20131226
Zend Extension Api No:   220131226
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：
[root@example.com xcache-3.2.0]# yum install -y m4 autoconf

或者下载源码编译安装