these 4 derivations will be built:
  /nix/store/vvhc0i7kv3prx2x4pjc1rwalw89mj4lx-src.drv
  /nix/store/5hd4hf7jfjdkb776xc9wlv0pyg90r5kl-nix-uci-0.0.1.drv
  /nix/store/q142gpqvcgmjwd98vf9qwwsfxsjibx93-uci.json.drv
  /nix/store/5a0v1i9mhn2hia37snwcksvvq4zkddh5-uci-commands.drv