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Date: Thu, 30 Jun 2005 13:13:56 -0701
From: Jos Backus <jos@catnook.com>
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Subject: Re: Suurce code navigation tools with call graph?
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Not free, but /usr/ports/devel/linux-understand_c should do what you want.
It's a pretty nice code spelunking tool, too.

-- 
Jos Backus
jos at catnook.com