[Dovecot] failed to start

greetings,

I'm having a bit of trouble running dovecot, I receive the error;

"Fatal: Can't create directory /usr/local/var/run/dovecot: No such file or directory"

with an unmodified install save for disabling imap and allowing secure imap and pop3, I uncommented the base_dir in the .conf, although that did nothing. Does anybody have any suggestions?

Many thanks, -Ex