these 3 derivations will be built:
  /nix/store/y0rv0xagkfqkanx5qnnc9il4m5niqk3x-v0.4.1.tar.gz.drv
  /nix/store/fxm4bwc0sfvwajnvm4y6yk9mifbk4byr-python-vendor.drv
  /nix/store/5a9sz4zv98mqcpr8f6cpmrk65iyz3zz3-mcptoon-0.4.1.drv