Your package fails to build with the newest autoconf-2.71, which was part of a recent wide Fedora change. More information about Fedora autoconf Change available here: https://fedoraproject.org/wiki/Changes/Autoconf_271#How_To_Test. The easiest way to reproduce the problem is to execute a fedora scratch-build on your package. Thank you for cooperation!
This is only partially related to autoconf 2.71: Some strange upstream code appends (outside of the automake framework) Makefile instructions during build to a Makefile include (doc/Makefile.{gdoc,gdoci}) which actually makes auto* assuming that automake needs to be re-run for the parent doc/Makefile. And that fails because autoconf 2.69 and automake 1.16 where used by upstream while Rawhide is already shipping autoconf 2.71 and 1.16.4 (and auto* dislikes any version changes except for full autoreconf etc.).
FEDORA-2021-b9d3f146cd has been submitted as an update to Fedora 35. https://bodhi.fedoraproject.org/updates/FEDORA-2021-b9d3f146cd
FEDORA-2021-b9d3f146cd has been pushed to the Fedora 35 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --advisory=FEDORA-2021-b9d3f146cd` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2021-b9d3f146cd See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2021-b9d3f146cd has been pushed to the Fedora 35 stable repository. If problem still persists, please make note of it in this bug report.