these 2 derivations will be built:
  /nix/store/a5yazjjfs66j9yhzn5q64l9wq4vrmvjb-iets-0.1.0.drv
  /nix/store/vpgv9w5nrljwavr699sxvq9gf2p3widk-iets-diff-e2e.drv