anchor.diff:  
   ###### implementation
   let
  -  inherit (pkgs) builderDefs ttmkfdir;
  +  inherit (pkgs) builderDefs;
     inherit (pkgs.xorg) mkfontdir mkfontscale fontalias;
   
     fontDirs = config.fonts.fonts;
  
positive.code:     rm fonts.alias
      mkfontdir
      mkfontscale
      mv fonts.scale fonts.scale.old
      mv fonts.dir fonts.dir.old
      ttmkfdir
      cat fonts.scale.old >> fonts.scale
      cat fonts.dir.old >> fonts.dir
      rm fonts.dir.old
      rm fonts.scale.old
      cat \$( find ${fontalias}/ -name fonts.alias) >fonts.alias
    ") ["minInit" "addInputs"];
    };
  
negative.code:   localDefs = with builderDefs; builderDefs.passthru.function rec {
      src = "";/* put a fetchurl here */
  
      buildInputs = [mkfontdir mkfontscale];
      configureFlags = [];
      inherit fontDirs;
      installPhase = fullDepEntry ("
  