these 4 derivations will be built:
  /nix/store/dys9ax5dyl3mnkh6jcdj0j2f8g1wswmi-uci.json.drv
  /nix/store/wb3ignjaakyxdzxbd81424f2w8907wwn-src.drv
  /nix/store/jxs0brg5268d0844rxcz0p9crq4dwb8l-nix-uci-0.0.1.drv
  /nix/store/4226683gnk2hqaxx4xyzrg5897iz0fr3-uci-commands.drv