Gnulib has a number of modules - whose only source files are *.m4 files, - with no dependencies.
According to the documentation <https://www.gnu.org/software/gnulib/manual/html_node/Copyright.html>, all *.m4 files are under a "unlimited permission to copy and/or distribute it" license. But this is not true: The files mprotect.m4 pkg.m4 sigaltstack.m4 stack-direction.m4 are under the "GPL with Autoconf exception" license. There are no practical consequences; however, the doc should be correct anyway. 2024-08-30 Bruno Haible <br...@clisp.org> doc: Correct statement about license of m4/*.m4 files. * doc/gnulib-intro.texi (Copyright): For m4/*.m4 files, list also the "GPL with Autoconf exception" as a possible license notice. diff --git a/doc/gnulib-intro.texi b/doc/gnulib-intro.texi index 7000fe199b..2ca732fac9 100644 --- a/doc/gnulib-intro.texi +++ b/doc/gnulib-intro.texi @@ -510,6 +510,21 @@ with or without modifications, as long as this notice is preserved. @end quotation +or under this copyright: + +@quotation +Copyright @copyright{} 20XX--20YY Free Software Foundation, Inc.@* +This file is free software, distributed under the terms of the GNU +General Public License as published by the Free Software Foundation; +either version 2 of the License, or (at your option) any later version. +As a special exception to the GNU General Public License, this file +may be distributed as part of a program that contains a configuration +script generated by Autoconf, under the same distribution terms as +the rest of that program. +@end quotation + +We denote either of these license statements as ``unlimited''. + @item tests/ If a license statement is not present in a test module, the test files are under GPL@. Even if the corresponding source module is under LGPL, this is
