these 2 derivations will be built:
  /nix/store/mmfkas4c4bkhr7a2p94hw7vmpfbfwln8-iets-deps-0.2.0.drv
  /nix/store/g3d1s7yrqrk8kl6s4j86rpc0w8rvfnkw-iets-doc-0.2.0.drv