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GNU config (config.sub/guess) is now GPLv3 with additional permission

This is a notice to all packages that use GNU config (aka config.sub and
config.guess) in their build systems.

Upstream has changed the license to GPLv3.  It has an additional
permission to negate any "viral effects", but it only applies to
packages that include a configuration script generated by GNU

The new autotools-dev package, with the changed license, has been
uploaded to Debian unstable a few minutes ago.

If your package is GPLv3, this license change is not a problem.

If your package uses GNU autoconf or GNU automake, this license change
shouldn't have any further effects, as it explictly allows you to
continue distributing your package under another license.

The above covers the vast majority of packages, as it is very rare for
any build system to need config.sub or config.guess and _not_ use GNU

Here is the new license text for config.sub and config.guess:

   This file is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.

   As a special exception to the GNU General Public License, if you
   distribute this file as part of a program that contains a
   configuration script generated by Autoconf, you may include it under
   the same distribution terms that you use for the rest of that
   program.  This Exception is an additional permission under section 7
   of the GNU General Public License, version 3 ("GPLv3").

  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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