安装xcache是出现：

[root@master xcache-3.0.4]# /usr/local/php/bin/phpize
Configuring for:
PHP Api Version:         20121113
Zend Module Api No:      20121212
Zend Extension Api No:   220121212
Cannot find autoconf. Please check your autoconf installation and the
$PHP_AUTOCONF environment variable. Then, rerun this script.

解决方法：

yum install m4* autoconf*

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安装xcache是出错