On Jul 31, 2009, at 15:47, Tena Sakai wrote:
> I solved the problem in a different way.  I went to
>  http://rubyonrails.org/download
> and navigated to download a file rubygems-1.3.5.tgz.
>
> I untar'ed and extracted the tar file.  Then I typed:
>  ruby setup.rb
> and it seems all is well (though I haven't really
> done enough testing yet).

This is correct.  You need to install RubyGems in each ruby  
installation you wish to use.