anchor.diff:          ";
         };
         
  -      extraChrootPaths = mkOption {
  -        default = [];
  -	example = ["/var/dist"];
  -	description = ''
  -	  Extra paths to include in chroot. May be useful if you build
  -	  from private repository mirrors to avoid extra checksumming 
  -	  and copying to store.
  -	'';
  -      };
  -
         distributedBuilds = mkOption {
           default = false;
           description = "
  
positive.code:   ###### implementation
  
    config = {
  
      environment.etc =
        [ { # Nix configuration.
  
negative.code:         ";
        };
  
        chrootDirs = mkOption {
          default = [];
  	example = [ "/dev" "/proc" ];
  	description =
  	  ''
  	    Directories from the host filesystem to be included
  	    in the chroot.
  	  '';
        };
  
        extraOptions = mkOption {
          default = "";
          example = "
  