You need to pass something when you install mysql gem. Just google for it.

On Tue, May 26, 2009 at 3:20 PM, Raghavendra Kamat
<raghavendra.kamat / in.v2solutions.com> wrote:
> Hi all,
>  ¨Â áí èáöéîç éóóõåó ÷éôè éîóôáììéîç ôèíùóñçå÷éôè ôèíùóñ> version 5.0.81 .Bulk updating Gem source index for:
> http://gems.rubyforge.org
> Building native extensions.  ¨Âèéãïõìôáëå ÷èéìå®®®
> ERROR:  ¨Âòòïò éîóôáììéîç íùóñìº
>  ¨ÂÒÒÏÒÆáéìåä ôï âõéìçåîáôéöå åøôåîóéïî®
>
> /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
> extconf.rb install mysql -- --with-mysql-dir=/usr/local/mysql
> --with-mysql-lib=/usr/local/mysql/lib
> --with-mysql-include=/usr/local/mysql/include
> can't find header files for ruby.
>
>
> Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/mysql-2.7
> for inspection.
> Results logged to /Library/Ruby/Gems/1.8/gems/mysql-2.7/gem_make.out
>
> I just tried googing and also referred a lots of blogs but nothing seems
> to be working.
>
> Anbody please shed some light on this issue of mine
> --
> Posted via http://www.ruby-forum.com/.
>
>