Your package fails to build with the newest upcoming autoconf-2.71, which is part of a wide Fedora change. Please see the attached copr: https://copr.fedorainfracloud.org/coprs/odubaj/autoconf-2.70/packages/. More information about testing your package when building with autoconf available here: https://fedoraproject.org/wiki/Changes/Autoconf_271#How_To_Test
Gentle ping.
It is expected that non-x86 package will fail to build in x86_64 buildroot.
We also provide a way to test non-x86_64 arch packages. Please see this section: https://fedoraproject.org/wiki/Changes/Autoconf_271#How_To_Test. If everything works as expected, please give us feedback. Thank you!
I have tested the builds natively before closing, it builds OK. The report itself is a false positive.
Thanks for clarification!