Comments - MacBook user wonders if macport was installed incorrectly, of if she is just stupid.
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I think it's a good idea to run the MacPorts de-installer. If it got as far as installing a launchd script, then you could end up with two copies of MariaDB running, competing for the same default port (3306).
I think the Homebrew folks recommend uninstalling other package managers before installing Homebrew, as sometimes they fight over the $PATH variable.
So, first do something like "port uninstall mariadb" (but look it up, I don't have it installed, so I can't tell you how it works).
Then use the MacPorts procedure for uninstalling itself.
Then install Homebrew.
Then do "brew install mariadb". That should give you MariaDB 10.1.17.
Package managers are a joy when they work right, and a royal PITA otherwise...