anchor.diff:      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"];
     };
  
positive.code:   localDefs = with builderDefs; builderDefs.passthru.function rec {
      src = "";/* put a fetchurl here */
  
      buildInputs = [mkfontdir mkfontscale ttmkfdir];
      configureFlags = [];
      inherit fontDirs;
      installPhase = fullDepEntry ("
  
negative.code: 
  ###### implementation
  let
    inherit (pkgs) builderDefs;
    inherit (pkgs.xorg) mkfontdir mkfontscale fontalias;
  
    fontDirs = config.fonts.fonts;
  