Comments - MariaDB 10.0.7 Release Notes
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Yes, as of 10.0.7, you need to use
ignore_builtin_innodb. The note about it being unnecessary related to 5.5 tree, where XtraDB is default, but it is not so in 10.0 yet. You also need to provide
plugin-load=ha_xtradboption to make XtraDB load instead of the ignored default InnoDB.