Copied from a ruby-talk posting by David Heinemeier Hansson:

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LoadModule ruby_module        libexec/httpd/mod_ruby.so
AddModule mod_ruby.c

<IfModule mod_ruby.c>
     RubyRequire apache/ruby-run
     RubyRequire auto-reload
     <Files *.rbx>
            SetHandler ruby-object
            RubyHandler Apache::RubyRun.instance
     </Files>
</IfModule>
==========================