these 2 derivations will be built:
  /nix/store/ihwrc5slm7197bz6j39kbrkpl77b7pqw-zcode-3.14.5.drv
  /nix/store/lkcgs3gz1w3kq1gydgnmrnykhmw1gzbd-check-zcode.drv
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy