please help

i am running Mac os x 10.5.7 - have mysql 64 bit installed - ruby
1.8.6 - rails 2.2.2.  All ruby and rails functions seemed to be
working fine until I tried to do a simple rake db:migrate last night
and got errors that seemed to indicate mysql gem needed to be
installed (is this true?), I tried to install it and got ruby header
errors (amongst others) wich indicated i needed to install xCode (from
OS dvd), so i installed that and then was (i think) able to get the
mysql gem on but the migrate still throws funky errors:

dyld: lazy symbol binding failed: Symbol not found: _mysql_init
  Referenced from: /Library/Ruby/Gems/1.8/gems/mysql-2.7/lib/
mysql.bundle
  Expected in: dynamic lookup

and does not work! Now I am not sure where I stand and after much
googling it seems many people are going through this and there are
various fixes and advice but all of them different.

I now have like 9 GB worth of xCode on my system (for a reason I don't
grasp) - may or may not have the mysql gem installed - and still cant
migrate.

can someone tell me if this situation is common?  what the correct fix
is?  Do I need xCode?  How do i uninstall xCode if I don't?

Rails/mySQL/Mac is about as common a marriage there is, so I cant
imagine I am alone.

pretty sure I can back out the huge xCode install and uninstall the
mySQL driver to start over if someone can walk me through the correct
resolution.

thanks
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