php编译扩展库时报错：Cannot find autoconf. Please check your autoconf installation and the $PHP_AUTOCONF environment variable. Then, rerun this script.
[root@zixuephp swoole-4.2.1]# /usr/local/php/bin/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.
解决报错：
yum install m4 yum -y install autoconf
