Uninstalling MySql on OSX

Recently I installed mysql-5 on my laptop using the .dmg installer. Later I decided that I wanted to use mysql-4 instead. Since there is no mysql uninstaller for os x, I did [rm -rf /usr/local/mysql], thinking this would do the trick. The problem, however, is now when I try to install mysql I keep getting the message "You cannot continue. There is nothing to install." After poking around a bit more I found out that you need to delete the "mysql*.pkg/" directories located in /Library/Receipts

That did the trick!