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Autoconf Exception

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.
