these 3 derivations will be built:
  /nix/store/d6m588rjwzp68bkwj7b54gsjkqdqng71-source.drv
  /nix/store/7wc5bva0xjzpqsh48lhxbmjpaivhbp02-iets-deps-0.1.0.drv
  /nix/store/ia2d779ab4gdly2s6d26nqfs8ww4h4g4-iets-examples-0.1.0.drv