我正在使用wordpress：PHP7.1-fpm-alpine,它基于PHP：7.1-fpm-alpine(https://github.com/docker-library/wordpress/blob/master/php7.1/fpm-alpine/Dockerfile).

我试过RUN pecl install xdebug-2.5.0&& docker-PHP-ext-enable xdebug

这会在构建时导致错误：

Step 19/19 : RUN pecl install xdebug-2.5.0     && docker-PHP-ext-enable xdebug
 ---> Running in 52c988e12cb2
downloading xdebug-2.5.0.tgz ...
Starting to download xdebug-2.5.0.tgz (267,640 bytes)
........................................................done: 267,640 bytes
76 source files,building
running: PHPize
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.