I took the ruby code here (http://www.hypermetrics.com/rubyset.html) and 
created a file "set.rb" in "/usr/local/lib/ruby/site_ruby".

I then do a "require set" in my code.

When I attempt to initialize something with "Set.new", I get 
"uninitialized constant Set (NameError)"

"ruby -e 'puts $:'" yields

/usr/local/lib/ruby/site_ruby/1.6
/usr/local/lib/ruby/site_ruby/1.6/i686-linux
/usr/local/lib/ruby/site_ruby
/usr/local/lib/ruby/1.6
/usr/local/lib/ruby/1.6/i686-linux

I've dug around and come up empty.  What am I doing wrong?

Thanks
David