these 2 derivations will be built:
  /nix/store/shaiwal7azq1dn7pixbgqlg7fkdgs4y8-iets-0.1.0.drv
  /nix/store/0x8ah1pcr5fkg9j8bfl2c9j55pdnkgwf-iets-diff-e2e.drv