I just downloaded Foxtails (the FXRuby extensions), and upon running the install scripts I was surprised to see that a bunch of the ruby files that came with it had been copied over into my ruby/lib/site_ruby/1.8 directory. Is there a reason why installing libraries needs to make changes to the directory in which ruby itself is installed? I would have expected the installation to instead make additions to the path in $: instead. How does 'require', $:, and installation of new libraries work? (Hyperlink welcome; I did not find what I needed in pickaxe). Thanks ...