these 2 derivations will be built:
  /nix/store/ai04l7sxlidm08zgvnlragrg9zr3k4w5-iets-0.1.0.drv
  /nix/store/d20z5kqkvnfi6vfrnkprrwmjmpx1kav3-iets-diff-e2e.drv