these 2 derivations will be built:
  /nix/store/2g67b83fy9jpb1ni7hg76xjqf04ws3rq-closure-info.drv
  /nix/store/sxxapwrc87qfq9ak429hvp6rbvzabazd-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy