Maia still runs on PHP 5.6, which is both old and as of December 31st 2018 (in two days from today) will be officially deprecated: https://secure.php.net/supported-versions.php There is both a current fork (https://github.com/technion/maia_mailguard) and an updated version 1.0.4-1 (https://www.purplehat.org/downloads/maia/) available. The official Maia website (http://www.maiamailguard.com/maia/blog/TechnionFork) states about the fork: "Think of it as an "unofficial 1.0.4"; until such time as a 2.0 is released, this is the version you'll want to use." The fork appears to run fine with newer PHP versions. databases/pear-MDB2_Driver_mysql is already marked IGNORE for PHP 5.6 and https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232590 tries to solve this with a stopgap measure. Overall, this port needs to be updated with current PHP 7.x dependencies.
Fixed by committing the change in PR#234518
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