Gem install mysql error with Xampp

Hello,

I’m trying to install mysql (to use it with Rails 2.2), without any
success.
After browsing the web, I found some tips (I need to target the xampp
files), but it’s still not working finally.

My command line is the following :
sudo gem install mysql –
–with-mysql-dir=/Applications/xampp/xamppfiles/
–with-mysql-config=/Applications/xampp/xamppfiles/bin/mysql_config

Results :
Building native extensions. This could take a while…
ERROR: Error installing mysql:
ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
extconf.rb install mysql –
–with-mysql-dir=/Applications/xampp/xamppfiles/
–with-mysql-config=/Applications/xampp/xamppfiles/bin/mysql_config
checking for mysql_ssl_set()… yes
checking for mysql.h… no
checking for mysql/mysql.h… no
*** 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=/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
–with-mysql-config

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

Do I have to install something else ? I found a developer package in
Xampp website, but I don’t know if I have to use it and how to use it…
http://www.apachefriends.org/en/xampp-macosx.html#849

Anyone could help me?

Thank you very much.
Vincent