Postfix doesn't start

[Vinzstyle]

Hi,

I installed Postfix with PCRE support from the ports collection, but I get this 
error when I try to start it :

Oct  4 20:22:09 mail postfix/postfix-script[47114]: starting the Postfix mail 
system
Oct  4 20:22:09 mail postfix/master[47115]: fatal: open lock file 
/var/db/postfix/master.lock: cannot open file: Permission denied

[root at mail /]# ls -ld /var/db/postfix/
drwx------  2 postfix  wheel  512 Oct  4 20:16 /var/db/postfix/

The "mail_owner" directive is set to "postfix" in main.cf

Is there some things to set up after the "make install" ? Did I miss something 
?

I'm running FreeBSD-7.2-RELEASE, and Postfix(-2.5.6,1) is started inside a 
jail.

Thanks for your help :)