Hmm.. The problem right off the bat is that on my FC5 box, the /usr/local/src directory exists, but that folder is empty - apt-get src maildrop returns an error "-bash: apt-get: command not found". (This is the very first command on the list.)
I have searched for "apt-get" and it is nowhere on the box.
This howto appears to be targeted at Debian - does it also properly apply to FC5?