Installing mySql GEM on Ubuntu?

I am running Linx Mint, a version of Ubuntu, and I installed Ruby
and Rails. However, when I try to install the mySql package via. gem, "gem
install mysql" I get an error message (See below) with no idea how to fix
the error. I looked on the net (Google), but all suggestions do not work
with this Linux.

Also, as far as I know, I have all of the correct mySql drivers/headers,
etc.

=================== error message ==================================

Select which gem to install for your platform (i486-linux)
1. mysql 2.7.3 (mswin32)
2. mysql 2.7.1 (mswin32)
3. mysql 2.7 (ruby)
4. mysql 2.6 (ruby)
5. mysql 2.5.1 (ruby)
6. Cancel installation
3
Building native extensions. This could take a while...
extconf.rb:1:in `require': no such file to load -- mkmf (LoadError)
from extconf.rb:1

ERROR: While executing gem ... (RuntimeError)
ERROR: Failed to build gem native extension.
Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/mysql-2.7 for inspection.
.

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