FreeBSD下swoole的安装方法

Configuring for:
PHP Api Version:         20160303
Zend Module Api No:      20160303
Zend Extension Api No:   320160303
Cannot find autoconf. Please check your autoconf installation and the
$PHP_AUTOCONF environment variable. Then, rerun this script.

In file included from /root/swoole/swoole.c:25:
In file included from /usr/local/include/php/ext/spl/spl_iterators.h:27:
/usr/local/include/php/ext/pcre/php_pcre.h:29:10: fatal error: 'pcre.h' file not found