these 2 derivations will be built:
  /nix/store/xck17nhwl9rszvfyz88ayrdk4yh6qr0w-collie-1.19.0.drv
  /nix/store/4g84vnhjhni840j8dvf14vgjdaz326sf-check-collie.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy