From: Hans Mackowiak <hanmac@...>
Date: 2011-08-11T16:39:04+09:00
Subject: Re: Supporting both ruby 1.8 and 1.9 in a compiled library

the better way: build your *.so twice, one for each version and put the 
files in the vendor_ruby path

so require "yourname" does work for both and you does not need an extra 
rb file

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