these 3 derivations will be built:
  /nix/store/9nqvnpdw3wpr3rbww4yf393i81lfrk4i-source.drv
  /nix/store/k0s9crmzlc2g1iqk6jhz4fkq8sjj0b1c-mcptoon-0.8.39.drv
  /nix/store/jvgzfv6igjw1jvwr1rk6dl0avp5y69sh-check-mcptoon.drv