these 2 derivations will be built:
  /nix/store/rspw6bxm4bk9q6lzgdjlgfpv646vdqj7-source.drv
  /nix/store/fqvvmm0jpx5bqzn8f5xp3f88sv5hca2g-vix-0.5.8.drv