When trying to install snapshot 20111118, I get a fatal postconf error if master.cf does not exist in the $config_directory. There is no problem if main.cf is missing from $config_directory; bin/postconf only seems to complain (at install stage, when called by the postfix-install script) if master.cf is not found. This is new to me, and could very well be idiosyncratic to my installation procedure. But before I troubleshoot further on my end, I wonder if anyone else can generally reproduce this?
-- Sahil Tandon