anchor.diff:              Directories from the host filesystem to be included
               in the chroot.
             '';
  +      };
  +
  +      autoOptimiseStore = mkOption {
  +        type = types.bool;
  +        default = true;
  +        description = ''
  +          Whether the store will auto-optimise after each derivation addition.
  +        '';
         };
   
         extraOptions = mkOption {
  
positive.code: 
        nixPath = mkOption {
          type = types.listOf types.str;
          default =
            [ "/nix/var/nix/profiles/per-user/root/channels/nixos"
              "nixos-config=/etc/nixos/configuration.nix"
              "/nix/var/nix/profiles/per-user/root/channels"
            ];
          description = ''
            The default Nix expression search path, used by the Nix
            evaluator to look up paths enclosed in angle brackets
  
negative.code:         binary-caches = ${toString cfg.binaryCaches}
          trusted-binary-caches = ${toString cfg.trustedBinaryCaches}
          binary-cache-public-keys = ${toString cfg.binaryCachePublicKeys}
          auto-optimise-store = ${toString cfg.autoOptimiseStore}
          ${optionalString cfg.requireSignedBinaryCaches ''
            signed-binary-caches = *
          ''}
  