Errors when installing IMAP extension on official PHP docker image [duplicate]

Question

If you're installing the IMAP extension in your PHP docker image, it's possible that you get some errors like:

configure: error: utf8_mime2text() has new signature, but U8T_CANONICAL is missing. This should not happen. Check config.log for additional information.

and then:

configure: error: This c-client library is built with Kerberos support.

Cambridgeshire

Answer 1

To solve this error:

configure: error: utf8_mime2text() has new signature, but U8T_CANONICAL is missing. This should not happen. Check config.log for additional information.

You just need to run the next command:

apt update && apt install -y libc-client-dev libkrb5-dev && rm -r /var/lib/apt/lists/*

So, now is probably that a new error appear:

configure: error: This c-client library is built with Kerberos support.

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

Cambridgeshire

I had some follow up issues caused by the && rm -r /var/lib/apt/lists/* part. Just in case anyone else is unfamiliar with it: You can leave out that part as it isn't related to this issue in particular. You should read about the associated best practices e.g. in the official docs. – Claudioclaudius