I hit an error when running `sudo nixos-rebuild switch`:

```
building the system configuration...
error: Package ‘gst-plugins-base-0.10.36’ in /nix/store/yb3syfc6v7sbg3n62cyy29ymiyk779ki-nixos-20.09pre239318.c59ea8b8a0e/nixos/pkgs/development/libraries/gstreamer/legacy/gst-plugins-base/default.nix:55 is marked as broken, refusing to evaluate.
```

It seems to have things to do with https://github.com/NixOS/nixpkgs/issues/93174. But I don't know how to work around it.