anchor.diff:  # That is why this expression is not inside pkgs.xorg
   
   { lib, stdenv, fetchurl, makeWrapper, libX11, pkg-config, libXaw }:
  +
   stdenv.mkDerivation rec {
     pname = "xfontsel";
     version = "1.0.6";
  
positive.code:       --set XAPPLRESDIR $out/share/X11/app-defaults
    '';
  
    meta = {
      homepage = "https://www.x.org/";
      description = "Allows testing the fonts available in an X server";
      license = lib.licenses.free;
      maintainers = with lib.maintainers; [ viric ];
      platforms = with lib.platforms; linux ++ darwin;
    };
  }
  
negative.code:   };
  
    nativeBuildInputs = [ pkg-config makeWrapper ];
  
    buildInputs = [ libX11 libXaw ];
  
    # Without this, it gets Xmu as a dependency, but without rpath entry
  