these 3 derivations will be built:
  /nix/store/q32s0rgh5s7b4zzf57gg981db1m7l6sx-source.drv
  /nix/store/zx4alz32h5bqab6jq44aa5a7cyvg2z1c-harmonia-deps-3.1.0.drv
  /nix/store/2843i53sph97rkdrwiky1qqrqz0k92ip-harmonia-3.1.0.drv