Comments - MariaDB 10.0.7 Release Notes

Having strange issues with trying to enable XtraDB engine in 10.0.7 on CentOS if i install it and set ignore_builtin_innodb in my.cnf will result in MariaDB server not starting up as it complains that alot of innodb_* variables are unknown. i.e.

140205 19:53:49 mysqld_safe mysqld from pid file /var/lib/mysql/hostname.localdomain.pid ended
140205 19:54:37 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
140205 19:54:37 [Note] Plugin 'FEEDBACK' is disabled.
140205 19:54:37 [ERROR] Unknown/unsupported storage engine: InnoDB
140205 19:54:37 [ERROR] Aborting

From docs it says it shouldn't be set anymore https://mariadb.com/kb/en/xtradbinnodb-server-system-variables/#ignore_builtin_innodb ? But if I do not set ignore_builtin_innodb, then even with XtraDB plugins installed, I don't see any different variables pertaining to XtraDB specifically, it's same as before XtraDB was installed.

mysql -e "SELECT * FROM mysql.plugin;"
+-----------------------------+------------------------+
| name                        | dl                     |
+-----------------------------+------------------------+
| METADATA_LOCK_INFO          | metadata_lock_info.so  |
| QUERY_CACHE_INFO            | query_cache_info.so    |
| QUERY_RESPONSE_TIME         | query_response_time.so |
| QUERY_RESPONSE_TIME_AUDIT   | query_response_time.so |
| XTRADB_READ_VIEW            | ha_xtradb.so           |
| XTRADB_INTERNAL_HASH_TABLES | ha_xtradb.so           |
| XTRADB_RSEG                 | ha_xtradb.so           |
| INNODB_CHANGED_PAGES        | ha_xtradb.so           |
+-----------------------------+------------------------+

with XtraDB installed and blank my.cnf - variables outputted

pastebin output at http://pastebin.com/q4v4Mz7p