对php编译安装时出现“Cannot find autoconf. Please check your autoconf installation and the $PHP_AUTOCONF environment variable. Then, rerun this script.”

在 centos 中，对 php 扩展进行编译安装时，出现下面的提示

Cannot find autoconf. Please check your autoconf installation and the

$PHP_AUTOCONF environment variable. Then, rerun this script.

解决办法：

yum install autoconf