this derivation will be built:
  /nix/store/4gndlhbkxjx71fy6m0iip7gh07br1rq0-check-zcode.drv
building '/nix/store/4gndlhbkxjx71fy6m0iip7gh07br1rq0-check-zcode.drv'

upload niks3: ok