The configure script for libuninum uses the exit function without including stdlib.h. This means that future compilers which do no support implicit declarations by default will fail to build libuninum.
Created attachment 1941309 [details] libuninum-fedora-rawhide-port-configure-to-c99.patch This patch should fix the issue. Scratch build here: https://koji.fedoraproject.org/koji/taskinfo?taskID=96918231
Created attachment 1941330 [details] libuninum-fedora-rawhide-port-configure-to-c99-v2.patch v2 patch: removed unnecessary 'touch' added at build time. New scratch build: https://koji.fedoraproject.org/koji/taskinfo?taskID=96920462
Seems to be fixed: https://koji.fedoraproject.org/koji/buildinfo?buildID=2144591