these 2 derivations will be built:
  /nix/store/p4a7k6smwka5dw06ck77szzsp2fb9g16-gascity-1.5.1.drv
  /nix/store/fp4f3l7kkx5ahv62dz9cfjv9bgkbj7dr-check-gascity.drv
this path will be fetched (6.2 KiB download, 53.6 KiB unpacked):
  /nix/store/jdirs4yfs32lmq8qadpa2bfgdqr6lfyd-flock-0.4.0