When running .setup for the first time on a brand new rhel 4 install (not a dev install), I received the following errors

usage: sudo -V | -h | -L | -l | -v | -k | -K | [-H] [-P] [-S] [-b] [-p prompt]
            [-u username/#uid] [-r role] [-t type] -s | <command>
usage: sudo -V | -h | -L | -l | -v | -k | -K | [-H] [-P] [-S] [-b] [-p prompt]
            [-u username/#uid] [-r role] [-t type] -s | <command>

The first time it happened was right  after it had prompted me for the mysql port and it was trying to install mysql files for the first time. It then couold not connect to the mysql database. I was able to continue with the installation by grepping the setup script for sudo and  running the four commands I found by hand. My guess is that the problem is part of sudoPrefixTo, but I'm no programmer, so I'll leave it to you.

 Let me know if I can provide you with any other info,

Susan B