[Dovecot] dovecot starts and exit immediately? - help needed

Since nobody answered my previous question on dovecot marking new mails as old mails, I decided to build a version of dovecot of my own to debug.

I downloaded and compiled dovecot 1.0 (stable). After setting up the conf file, I ran dovecot but it exited immediate with status 0. As a result, remote client cannot connect and retrieve mails.

There is no man page, and I only found two command line options, -F and -c. None of these options seem to matter.

Any suggestions? I must have done something simple and wrong here.

Jun