these 3 derivations will be built:
  /nix/store/614lf6xjcz1970iz407r5sm6m0p1mqlp-source.drv
  /nix/store/ddzmg52w8526w7gq4mv8yxbf3mgywhym-mcptoon-0.8.28.drv
  /nix/store/mca22f8yk7613yh1jxkzsgi3pqh0jwpy-check-mcptoon.drv