these 2 derivations will be built:
  /nix/store/30s7r4vl32vhg3xmfs0fsm1frjbkk0c4-gnhf-0.1.51.drv
  /nix/store/dx9pmhcf7p83zks9jli7k61jfy4xgvk1-check-gnhf.drv