these 2 derivations will be built:
  /nix/store/72cs5r1v6h3193hy56ggziadp9vgy7m6-iets-0.1.0.drv
  /nix/store/2s6xn0s8i0jr7f1vmfpqq36zrrw8q44y-iets-langtests.drv