this derivation will be built:
  /nix/store/gl6b9k913irp11s11fpv73xkwzd5nbb6-check-icm.drv
gl6b9k913irp11s11fpv73xkwzd5nbb6-check-icm.drv: bld4: not scheduled here: gl6b9k913irp11s11fpv73xkwzd5nbb6-check-icm.drv, asking the scheduler again