I cannot cannot connec the mysql2 gem

rails s
/usr/local/share/gems/gems/mysql2-0.3.13/lib/mysql2.rb:8:in require': cannot load such file -- mysql2/mysql2 (LoadError) from /usr/local/share/gems/gems/mysql2-0.3.13/lib/mysql2.rb:8:in <top (required)>’
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in require' from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in block (2 levels) in require’
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in each' from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in block in require’
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in each' from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in require’
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler.rb:132:in require' from /home/Harish/Documents/simple_cms/config/application.rb:7:in <top (required)>’
from /usr/local/share/gems/gems/railties-4.0.0/lib/rails/commands.rb:76:in require' from /usr/local/share/gems/gems/railties-4.0.0/lib/rails/commands.rb:76:in block in <top (required)>’
from /usr/local/share/gems/gems/railties-4.0.0/lib/rails/commands.rb:73:in tap' from /usr/local/share/gems/gems/railties-4.0.0/lib/rails/commands.rb:73:in <top (required)>’
from bin/rails:4:in require' from bin/rails:4:in

Have you installed mysql libraries?

If you look in the lib folder mentioned above is there a subdirectory
mysql2 containing mysql2.so?
If not then I suspect your mysql2 gem has not installed correctly.

Colin