Hi Paul, The files m4/std-gnu11.m4 and m4/std-gnu23.m4 that you added have a license notice of GPLv3+. This contradicts the module's license notice, which says "unlimited" in both cases.
We can't easily change the module's license notice to GPLv3+, because the module 'c99' depends on std-gnu11, and with it a whole slew of other modules. As far as I understand, the code in these two files comes from autoconf/lib/autoconf/c.m4, which carries a license notice with Autoconf exception. So, the fix to the contradiction appears to me to be to change the license notice of m4/std-gnu11.m4 and m4/std-gnu23.m4 to the following (copied from autoconf/lib/autoconf/c.m4, with an added URL in the last sentence). # This file is part of Autoconf. This program 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 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # Under Section 7 of GPL version 3, you are granted additional # permissions described in the Autoconf Configure Script Exception, # version 3.0, as published by the Free Software Foundation. # # You should have received a copy of the GNU General Public License # and a copy of the Autoconf Configure Script Exception along with # this program; see the files COPYINGv3 and COPYING.EXCEPTION # respectively. If not, see <https://www.gnu.org/licenses/> and # <https://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=blob_plain;f=COPYING.EXCEPTION>. Do you agree with that? Bruno
