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Is there a replacement for xref?

From: Hongzheng Wang
Subject: Is there a replacement for xref?
Date: Thu, 20 Nov 2003 22:09:50 +0800
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5) Gecko/20031024 Debian/1.5-2

Hi, everyone

  Recently, some friends suggested me to use xref in order
to give emacs a more powerful programming environment
support. And I find it is very useful.
  But according to xref's license, it is not a free software.
I wonder if there is a GPL replacement for xref?
  Thank you. :-)

Hongzheng Wang
Department of Electronics Engineering
Tsinghua University

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