these 2 derivations will be built:
  /nix/store/pw25as7g4rdqi3b4lvzjcgk4vpd3z53g-fx-0.0.13.drv
  /nix/store/7i25gz84ahn313a2kmypw42m47xycnk7-check-fx.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy