在官方PHP docker映像上安装IMAP扩展名时出错
如果在PHP docker映像中安装IMAP扩展，则可能会出现一些错误，例如：
If you're installing the IMAP extension in your PHP docker image, it's possible that you get some errors like:
configure：错误：utf8_mime2text（）具有新的签名，但缺少
U8T_CANONICAL。这不应该发生。在config.log中查看
的其他信息。
configure: error: utf8_mime2text() has new signature, but U8T_CANONICAL is missing. This should not happen. Check config.log for additional information.
，然后：
配置：错误：此c客户端库是使用Kerberos
支持构建的。
configure: error: This c-client library is built with Kerberos support.
要解决此错误：
configure：错误：utf8_mime2text（）具有新签名，但是缺少
U8T_CANONICAL。这不应该发生。在config.log中查看
的其他信息。
configure: error: utf8_mime2text() has new signature, but U8T_CANONICAL is missing. This should not happen. Check config.log for additional information.
您只需要运行下一个命令：
You just need to run the next command:
apt update && apt install -y libc-client-dev libkrb5-dev && rm -r /var/lib/apt/lists/*
所以，现在可能是一个新的出现错误：
So, now is probably that a new error appear:
配置：错误：此c客户端库内置Kerberos
支持。
configure: error: This c-client library is built with Kerberos support.
要解决此新错误，必须使用以下命令安装扩展：
To solve this new error, you must install the extension with the next command:
docker-php-ext-configure imap --with-kerberos --with-imap-ssl && docker-php-ext-install imap