these 2 derivations will be built:
  /nix/store/hapiw1d4mzll5mincw2lfqmlj8fw7zdh-zcode-3.16.2.drv
  /nix/store/pssyi739csasz084aac2qw3972c7a8rc-check-zcode.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy