[Locomotive-users] Requiring Gems

[Rick Shafer]

OK... I can see that this topic has appeared several times, at least  
by doing a google, but I can't seem to be able to decode/apply any of  
the solutions (which often seem to be "oops, now its working"... I  
hate that sort of solution when my situation isn't working).

Here is the situation...
I am running Locomotive 2.0.8 with the RMagick Rails Mar 2007  
bundle.   I am running on a dual G5.  OS 10.4.10.

  I wanted to use the PDF::Writer package.   So, I went into the  
Locomotive launched terminal window for my project and ran:
gems update pdf-writer
It prompted me for several dependencies (I said yes), it built two  
kinds of documentation (rdoc was one of them), and then I got a  
prompt, and assumed that it had installed... somewhere....  (I seemed  
to find it but it was WAY deep and in multiple places (though some of  
it is the rdoc.... and a CVS entry?)).  The docs were in "PDF/Writer"  
as opposed to "pdf/writer".

Locomotive2/Bundles/rmagickRailsMar2007_ppc.locobundle/framework/lib/ 
ruby/gems/1.8/gems/pdf-writer-1.1.3/lib/pdf/writer/

The documentation for PDF::Writer included a "hello world" example,  
which I wanted to test.
require "pdf/writer"
       pdf = PDF::Writer.new
       pdf.select_font "Times-Roman"
       pdf.text "Hello, Ruby.", :font_size => 24, :justification  
=> :center
       pdf.save_as("hello.pdf")

I saved this as a simple file testwriter.rb at the top of my rails  
app hierarchy, and then at the terminal prompt say

ruby testwriter.rb

whereupon, I get the message
testwriter.rb:5:in `require': no such file to load -- pdf/writer  
(LoadError)
         from testwriter.rb:5

So, what am I doing wrong?  Is it in gems?  ruby?  Locomotive?  bad  
karma?

Thanks for your attention.