Neatvnc suddenly won't build, but hasn't had a new release in months

I’ve been using SDDM for weeks, but it started failing to build due to neatvnc. Isolating it from the rest of my system by using:

nix-shell -p neatvnc

And I get the following output: gist:0a883856cba2ff937539fa3b559e7de5 · GitHub

Looking at the github project, neatvnc hasn’t had a release since August, so I’m not sure why it’s failing now?

Is anyone able to point out what I’m doing wrong, or maybe confirm they can reproduce?

Yes, it has already been fixed in neatvnc: fix build with latest ffmpeg by K900 · Pull Request #353338 · NixOS/nixpkgs · GitHub.
You can track its progress here.

Oh, thanks! I didn’t even think to check the nixpkgs project page.