these 3 derivations will be built:
  /nix/store/jxihyyknd2lbicav3a5g7irik435h2zj-iets-0.1.0.drv
  /nix/store/a9injfsv3b05sqin8r2gpym76yy6kncn-iets-conformance-adapter.drv
  /nix/store/mxb11kxyfgdr237byg14h92pxj7lf0wd-nix-conformance-iets.drv