Duncan--
Yay! Congratulations! So glad you are: (1) back; and (2) not a member of that Great Newsgroup in the Sky!
I managed to build Sweet Solitude (0049344 github.com/GNOME/pan.git; x86_64-pc-linux-gnu) on my Fedora 33 host, but it wasn't easy. While I don't remember all the specific dependency installs I stumbled through -- having scant clue about what I was doing as I am not a coder -- nor the final make command that actually produced a viable executable, I have been able to continue using Pan without significant problems.
At some point I enabled Detlef Graef's _copr:copr.fedorainfracloud.org:dgraef:Pan repository.
My host is a Ryzen 7 3700X CPU with 64GB RAM and an AMD Radeon RX 5600 XT GPU, running the KDE desktop environment. Starting Pan from the application launcher menu does not work; the taskbar flickers briefly and then nothing. Launching pan from konsole with 'pan &' works fine. However, if I leave Pan idling for more than a handful of hours, it seizes 100% of a CPU until I kill the PID. Otherwise, functions work as intended.
--Lacrocivious Acrophosist
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Twice as crazy as I would be, if I was half as crazy as I am.