I have Xcode 3.0+ installed
Ruby 1.9.2
And a direct dmg for mysql

$ sudo gem install mysql -- --with-mysql-dir=/usr/local/mysql
Password:
Building native extensions.  This could take a while...
ERROR:  Error installing mysql:
ERROR: Failed to build gem native extension.

        /usr/local/bin/ruby extconf.rb --with-mysql-dir=/usr/local/mysql
checking for mysql_ssl_set()... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/local/bin/ruby
--with-mysql-config
--without-mysql-config
/usr/local/lib/ruby/1.9.1/mkmf.rb:368:in `try_do': The complier failed to 
generate an executable file. (RuntimeError)
You have to install development tools first.
from /usr/local/lib/ruby/1.9.1/mkmf.rb:435:in `try_link0'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:440:in `try_link'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:552:in `try_func'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:797:in `block in have_func'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:693:in `block in checking_for'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:280:in `block (2 levels) in postpone'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:280:in `block in postpone'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:276:in `postpone'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:692:in `checking_for'
from /usr/local/lib/ruby/1.9.1/mkmf.rb:796:in `have_func'
from extconf.rb:50:in `<main>'


Gem files will remain installed in 
/usr/local/lib/ruby/gems/1.9.1/gems/mysql-2.8.1 for inspection.

I really need to fix this problem and i dont have no idea how to 

thanks for the help

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