MariaDB source is not available when building in ports for 7.6-current; I waited a couple months now, thinking someone might fix it on their own. While I could grab it myself without a problem, I thought I might throw this out there.
I updated from 7.4 to 7.6, and I've been running into a number of problems while building ports; I'm more than willing to try to help track down issues, but last time I offered to donate my time to the project, I was quickly shot down. I love the project. Cheers, Lucretia.