key: autoconf-exception-2.0
short_name: Autoconf exception to GPL 2.0 or later
name: Autoconf exception to GPL 2.0 or later
category: Copyleft Limited
owner: Free Software Foundation (FSF)
is_exception: yes
spdx_license_key: Autoconf-exception-2.0
text_urls:
  - http://ac-archive.sourceforge.net/doc/copyright.html
other_urls:
  - http://ac-archive.sourceforge.net/doc/copyright.html
  - http://ftp.gnu.org/gnu/autoconf/autoconf-2.59.tar.gz
standard_notice: |
  This library 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 2, or (at your option) any later
  version.
  This library is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  more details.
  You should have received a copy of the GNU General Public License along
  with this library; see the file COPYING. If not, write to the Free Software
  Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  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.
text: |
  As a special exception, the Free Software Foundation gives unlimited
  permission to copy, distribute and modify the configure scripts that
  are the output of Autoconf.  You need not follow the terms of the GNU
  General Public License when using or distributing such scripts, even
  though portions of the text of Autoconf appear in them.  The GNU
  General Public License (GPL) does govern all other use of the material
  that constitutes the Autoconf program.

  Certain portions of the Autoconf source text are designed to be copied
  (in certain cases, depending on the input) into the output of
  Autoconf.  We call these the "data" portions.  The rest of the Autoconf
  source text consists of comments plus executable code that decides which
  of the data portions to output in any given case.  We call these
  comments and executable code the "non-data" portions.  Autoconf never
  copies any of the non-data portions into its output.

  This special exception to the GPL applies to versions of Autoconf
  released by the Free Software Foundation.  When you make and
  distribute a modified version of Autoconf, you may extend this special
  exception to the GPL to apply to your modified version as well, *unless*
  your modified version has the potential to copy into its output some
  of the text that was the non-data portion of the version that you started
  with.  (In other words, unless your change moves or copies text from
  the non-data portions to the data portions.)  If your modification has
  such potential, you must delete any notice of this special exception
  to the GPL from your modified version.