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From: xman <cshinyee@gmail.com>
Newsgroups: comp.lang.ruby
Subject: Re: How to get ruby to find a native lib?
Date: Thu, 16 Feb 2012 09:54:12 -0800 (PST)
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.ruby:6456

Try:

    export LIBRARY_PATH=/usr/local/lib

That works for me in Linux + GCC
The LD_LIBRARY_PATH is only effective when executing, not at compile time.