anchor.diff:        };
   
         buildMachines = mkOption {
  +        default = [];
           example = [
             { hostName = "voila.labs.cs.uu.nl";
               sshUser = "nix";
  
positive.code: 
        distributedBuilds = mkOption {
          default = false;
          description = "
            Whether to distribute builds to the machines listed in
            <option>nix.buildMachines</option>.
            If you know that the <option>buildMachines</option> are not
            always available either use nixos
            <command>nixos-rebuild --no-build-hook</command>
            or consider managing <filename>/etc/nix.machines</filename> manually
            by setting <option>manualNixMachines</option>. Then you can comment
            unavailable build machines.
          ";
        };
  
        manualNixMachines = mkOption {
          default = false;
          description = "
            Whether to manually manage the list of build machines used in distributed
            builds in /etc/nix.machines.
          ";
        };
  
        daemonNiceLevel = mkOption {
  
negative.code:             mandatoryFeatures = "perf";
            }
          ];
          description = ''
            This option lists the machines to be used if distributed
            builds are enabled (see
            <option>nix.distributedBuilds</option>).  Nix will perform
  