these 2 derivations will be built:
  /nix/store/ngs3a1a9ps1kyjdv2bcq0p910jspm5y0-iets-deps-0.1.0.drv
  /nix/store/adx82cp240n29lwmjj2wa0nqk1zypbp3-iets-doc-0.1.0.drv