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Explanation needed?

From: Reuben Thomas
Subject: Explanation needed?
Date: Mon, 23 Feb 2009 14:34:52 +0000 (GMT)
User-agent: Alpine 2.00 (DEB 1167 2008-08-23)

In the node "Installation Directory Variables" the following makefile fragment is given as an example:

     edit = sed \
             -e 's|@address@hidden|$(pkgdatadir)|g' \
             -e 's|@address@hidden|$(prefix)|g'

In the second line, why is datadir replaced by pkgdatadir? I know this isn't relevant to the example, but it caused me to wonder if it was a typo and check that the real code really does contain such a substitution. But it's still not obvious why, as datadir really isn't the same thing as pkgdatadir!

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