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: 
        maxJobs = mkOption {
          type = types.int;
          default = 2;
          example = 64;
          description = ''
            This option defines the maximum number of jobs that Nix will try
            to build in parallel.  The default is 2.  You should generally
            set it to the total number of logical cores in your system (e.g., 16
            for two CPUs with 4 cores each and hyper-threading).
          '';
  