these 4 derivations will be built:
  /nix/store/5xgnrqx2p8b2mlhxwair23zv004qjsc2-uci.json.drv
  /nix/store/vqr39r6qlr9qc0v78p9skdkj0f8j30h1-src.drv
  /nix/store/mr2ak5ypa5iw5kzjfz6dlx5py0r0i5j2-nix-uci-0.0.1.drv
  /nix/store/6paicsg23dzc8yqvjlvp5m4lhih38v8h-uci-commands.drv