centos中使用phpize编译php扩展的时候出现报错

[root@localhost swoole-4.5.5]# phpize
Configuring for:
PHP Api Version:         20170718
Zend Module Api No:      20170718
Zend Extension Api No:   320170718
Cannot find autoconf. Please check your autoconf installation and the
$PHP_AUTOCONF environment variable. Then, rerun this script.

　报错意思的是找到一个叫autoconf的工具，我们执行一下yum命令去安装即可

yum install autoconf