9208cef238
nixpkgs commit 5f91e2ea80 updated aria2p
from 0.12.0 to 0.12.1, breaking the build. The changelog for 0.12.1
(https://github.com/pawamoy/aria2p/blob/0.12.1/CHANGELOG.md) shows upstream
changed from the appdirs package to platformdirs, but this change
wasn't made in the above nixpkgs commit.