So it looks like the last thing is to just get your database going. Did you install mysql already? Have you confirmed its working outside of RT? The message Can't exec "mysql_config"
(I think) suggests you don’t have the db installed at all yet, but in case you do, I think you just need the db client development library, which you might be able to get with a yum install mysql-devel
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Thanks Todd, this fixed everything.