these 2 derivations will be built:
  /nix/store/8q748bqhhb6n3jg6mzb604ml2h8k3bmx-source.drv
  /nix/store/0v09v5lxpl98nhbnrwlj8m9nm5qm25r8-video-cutter-unstable-2021-02-03.drv