these 2 derivations will be built:
  /nix/store/l8nf44agzb340mk1wzhvwqm43m132kd0-closure-info.drv
  /nix/store/4av4gl20daqvkq89izypr268hm5v38lq-check-vars.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy