these 4 derivations will be built:
  /nix/store/f35yzyqn8kq0whmplddjwhadi5yzbf21-src.drv
  /nix/store/0bsvkb8c0vivmji29d84y24ilvbl80gq-nix-uci-0.0.1.drv
  /nix/store/vgv4glnxqqb0dirhjac49w7byz9mg36p-uci.json.drv
  /nix/store/nhrvw7ljmcsk49k1xpyvk8wb8rri0ksn-uci-commands.drv