these 2 derivations will be built:
  /nix/store/7yjq24d0b3dmp3wqjcm6rdj928lac5vz-closure-info.drv
  /nix/store/vffm41z0snwrr3rbip08cs6v8b69aw01-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy