Hi,
I think this is the same issue as:
https://root-forum.cern.ch/t/fail-to-compile-root-6-20-04-on-fedora-32
which resulted in:
The ticket above is closed so I understand this has been fixed in a more recent version (I am not sure which one since the ticket does not specify it).
@oksana @vvassilev do you want to comment?