[Koha] sh: mysql: command not found

Hi, I could install the last version of koha (koha-3.00.01-stable) on Mac os x 10.5.5. But in the third step of the web installation, I get this error : sh: mysql: command not found That is strange as it could connect to the database in the step 2 : Connection established. Database koha exists. User kohaadmin has all required privileges on database koha. This error appears only in the step three while trying to "create the database tables and fill them with some default data" Thanks for yours help, --- Anas