Tk is installed. I uninstalled it and reinstalled it using the yum package manager and the installed directory is the one I was trying to add to @INC. I have had issues in the past installing packages without using yum. However, I also run into instances like this where the directory structure has an issue. I submitted a bug report to bugzilla about it.

I found another post on this site regarding the error message and two items need changing in the script:

use Tk;  needs to be:
require Tk;
import Tk;

and

MainLoop, needs to be
&MainLoop;
[download]

However, making those changes generates another error, widgets not found and that is a part of the Tk installation. It is not in the directory or any where else on my computers (desktop or laptop) so there is definitely an issue with the Tk install. I will keep searching for how to install Tk properly. Thanks for your help.