Current build can't be installed on F38 because of version mismatch with bundled fftw.
# dnf up
[...]
Problem: cannot install the best update candidate for package furnace-0.5.8-3.fc38.x86_64
- nothing provides libfftw3.so.3.6.9()(64bit) needed by furnace-0.6-3.fc38.x86_64 from copr:copr.fedorainfracloud.org:ycollet:audinux
Current build can't be installed on F38 because of version mismatch with bundled fftw.