MySQL (Percona) et homebrew :

J'essaie d'exécuter le serveur MySQL (Percona) en launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.percona-server.plist et je vois le message suivant dans /var/log/system.log :

Aug  9 01:36:14 xxx com.apple.launchd.peruser.501[253] (homebrew.mxcl.percona-server[37257]): Exited with code: 1
Aug  9 01:36:14 xxx com.apple.launchd.peruser.501[253] (homebrew.mxcl.percona-server): Throttling respawn: Will start in 10 seconds

Si je l'exécute manuellement, cela me donne

$ /usr/local/opt/percona-server/bin/mysqld_safe
130809 01:49:36 mysqld_safe Logging to '/usr/local/var/mysql/xxx.local.err'.
130809 01:49:36 mysqld_safe Starting mysqld daemon with databases from /usr/local/var/mysql
/usr/local/opt/percona-server/bin/mysqld_safe: line 135: /usr/local/var/mysql/xxx.local.err: Permission denied
/usr/local/opt/percona-server/bin/mysqld_safe: line 172: /usr/local/var/mysql/xxx.local.err: Permission denied
130809 01:49:36 mysqld_safe mysqld from pid file /usr/local/var/mysql/xxx.local.pid ended
/usr/local/opt/percona-server/bin/mysqld_safe: line 135: /usr/local/var/mysql/xxx.local.err: Permission denied

Des idées ?