In what scenarios can the error "error mm is not thread-safe" occur during PHP compilation, and how can it be addressed?

The error "error mm is not thread-safe" can occur during PHP compilation when the mm memory manager is not configured to be thread-safe. To address this issue, you can reconfigure PHP with the --enable-maintainer-zts flag to enable thread safety for the mm memory manager. ```bash ./configure --enable-maintainer-zts make make install ```