these 2 derivations will be built:
  /nix/store/9yfb1m1dd4ijh2iwdl6ccb85aykabimx-deja-vu-0.23.5.drv
  /nix/store/ibs87mvdb8xjkljq9wnc2v31dg6zgbyl-check-deja-vu.drv