these 2 derivations will be built:
  /nix/store/f6lrh12kq8p1x7k1d49y7ia1sylnc58c-closure-info.drv
  /nix/store/aj2mrcd0vrgsjd0zv0mpw1xcbc5bk0bn-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy