This is a MariaDB module for the Godot Engine (only for GNU/Linux)
You need the mariadb C/C++ connector.
For ArchLinux users, see AUR : https://aur.archlinux.org/packages/mariadb-connector-c/
For Debian users : https://packages.debian.org/source/sid/mariadb-connector-c
For Gentoo users : https://packages.gentoo.org/packages/dev-db/mariadb-connector-c
Modify your mariadb library path in the SCsub file.
Download a zip file of the repository or clone this one. Rename the folder to 'mariadb' and move it into the /path/to/godot/modules