these 2 derivations will be built:
  /nix/store/h8h0xn83f12g4hlcyyxm2wwgb7fz5xr8-iets-0.2.0.drv
  /nix/store/kk7x48mpbl3s3imkab2rpdbs2hshs6wf-iets-classic-2.34.9.drv