mysql installation in Windows 7

I have Windows 7. I am trying to get the gem installed for MySQL Server 5.5 So, I get the zip file for gem from Brian Mario’s repository on github mysql2, extract it in the new mysql2-0.3.12b5 folder and start the procedure as follows. As seen below, I get the error “file 'lib' not found” at the end. I tried many times, got the same problem. Anyone has a solution to this?

EDZIBA-PC /c/railsinstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/mysql2-0.3.12b5 $ gem build mysql2.gemspec fatal: Not a git repository (or any of the parent directories): .git fatal: Not a git repository (or any of the parent directories): .git WARNING: no description specified   Successfully built RubyGem   Name: mysql2   Version: 0.3.12b5   File: mysql2-0.3.12b5.gem

EDZIBA-PC /c/railsinstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/mysql2-0.3.12b5 $ subst X: "C:\Program Files\MySQL\MySQL Server 5.5" Drive already SUBSTed

EDZIBA-PC /c/railsinstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/mysql2-0.3.12b5 $ gem install mysql2-0.3.12b5.gem --platform=ruby -- --with-mysql-dir=X: --with-mysql-lib=X:\lib Temporarily enhancing PATH to include DevKit... Building native extensions. This could take a while... Successfully installed mysql2-0.3.12b5 1 gem installed Installing ri documentation for mysql2-0.3.12b5... file 'lib' not found Installing RDoc documentation for mysql2-0.3.12b5... file 'lib' not found