these 2 derivations will be built:
  /nix/store/8q0jyizwv97vswvmjy2jrp1simb9wxra-deja-vu-0.24.2.drv
  /nix/store/cf18x2ldfd33wn0p1g83v5f1c2l8zgws-check-deja-vu.drv