PHP7 telnet localhost 19910 Connection closed by foreign host

Question

PHP版本：PHP 7.1.3手册上有这样的提示：截止2016-05-06, PHP官方的Libevent扩展不支持PHP7, PHP7下的Libevent安装方法: PHP7的Libevent分支. PHP的Libevent扩展需要Linux的库libevent. 安装Libevent：sudo yum -y install libevent libevent-devel具体应该怎么弄那？