...applies to a given file that bears a notice placed by the copyright holder of the file stating that the file is governed by GPLv3 along with this Exception. The purpose of this Exception is to allow distribution of Autoconf's typical output under terms of the recipient's choice (including proprietary). * 0. Definitions. * "Covered Code" is the source or object code of a version of Autoconf that is a covered work under this License. "Normally Copied Code" for a version of Autoconf...
--Autoconf Configure Script Exception License, Version 3.0. (Paragraph 4.)