ZHF #122042 Failing Hydra build: https://hydra.nixos.org/build/142591498 `apcu_bc`[1] is a PHP extension which provides support for the older APC caching-interface (i.e. `apc_fetch`, `apc_store` etc.) on newer PHP versions. As the codebase wasn't touched since 2019 it's not really surprising that it doesn't compile for PHP 8. Also, if people have already managed to get their codebases running on PHP8, they're most likely also using the newer APCu[2] interface. I think it's okay to keep this as long as we support PHP 7.4 and drop the package after that. [1] https://pecl.php.net/package/apcu_bc [2] https://www.php.net/manual/en/book.apcu.php