these 2 derivations will be built:
  /nix/store/5v4y61r100xgz6c0gf9p39m6cfr5mxm9-iets-0.1.0.drv
  /nix/store/a8g2vgpi131c1sc48ixnjaxd0jcm7x97-iets-diff-e2e.drv