Installation C-based MySQL library

Hi all,

have a newbee-to-rails-question.

I followed the instructions to install the C-based MySQL library in
database.yml for Windows.

- I installed a win32 build of th driver with "gem install mysql"
- The /bin directory of my MySQL-Server is in my path

But the driver don't work. In the development.log I always get the

WARNING: You're using the Ruby-based MySQL library that ships with
Rails. This library is not suited for production. Please install the C-
based MySQL library instead (gem install mysql).

What is going wrong?

My system:
- Win XP
- Rails 2.0.2
- MySQL 5.0.41

Thank a lot for help.