these 2 derivations will be built:
  /nix/store/vw3aw7kql8vacyafj18y5cx1647yyb1h-iets-0.2.0.drv
  /nix/store/zcn1kqpm009kpwxp3pf93vr9m6s0y2vy-iets-classic-2.34.9.drv