these 3 derivations will be built:
  /nix/store/5nvvyfccdqz3vj51ipaxx3lwkjgcyfr8-source.drv
  /nix/store/k1hiyn1dgjyjjybbi2fi5d5jqxhbipg5-mcptoon-0.8.3.drv
  /nix/store/5s7lw06zznw7dv4gm7aixmq9hbhdsv13-check-mcptoon.drv