these 2 derivations will be built:
  /nix/store/3vifn3iah3ly8yfwqjlr5k6b6fhfhwrq-iets-conformance-adapter.drv
  /nix/store/a8ndzlz1mbcc59zdh9rgxs1va99kjwak-nix-conformance-iets.drv