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Doubt on variable $<

From: visco
Subject: Doubt on variable $<
Date: Tue, 1 Dec 2009 05:08:17 -0800 (PST)
User-agent: G2/1.0 
Could anyone tell me what is the purpose of $<

I found it in a Makefile as follows
     $(CXX) $(CXXFLAGS) -c $< -o $@

Also it would be nice if anyone could give a link explaining spl.
variables used in bash

Thanks and regards
visco
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