On Nov 14, 2007, at 9:00 PM, John Slimick wrote:

> I am new to ruby, so I need some help.
> I want to use tk widgets when I teach ruby.
> I have downloaded and installed the ruby-1.8.6-p110
> distribution. When I tried to do the
> "Hello World" window in ruby/tk, irb
> could not find tk. I can find the tk directory
> which is at:
>
> /home/fred/Desktop/ruby/ruby-1.8.6-p110/ext/tk

That directory only contains the Ruby library that acts as a bridge  
between Ruby and Tcl/Tk.

> Is there a shell variable I need to set that
> contains where tk is? I couldn't find much
> help on google.

Probably not a shell variable problem (although there is a chance it  
is a PATH problem). It is more likely that Tcl/Tk is not installed on  
your system. Perhaps this URL will help.

    http://ruby.about.com/od/desktop/p/ruby_tk.htm

Regards, Morton