I don’t remember having to do this before, but I had compiled MySQL 5.1.34 recently on my dev box (os x) and I saw a warning on a create table statement. It turns out InnoDB was not enabled (or even listed in the list of storage engines. Before: mysql> show engines; +————+———+———————————————————–+————–+——+————+ | Engine | Support | Comment | Transactions | XA | Savepoints | +————+———+———————————————————–+————–+——+————+ | CSV | YES | CSV storage engine | NO | NO | NO | | MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO | | MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO | | MyISAM | DEFAULT | Default engine as of MySQL 3.