anchor.diff:    buildInputs =
       [ pkgconfig bc perl libjpeg mesa gtk libxml2 libglade pam
         libXext libXScrnSaver libX11 libXrandr libXmu libXxf86vm libXrender
  -      libXxf86misc intltool
  +      libXxf86misc intltool xorg.appres makeWrapper
       ];
   
     preConfigure =
  
positive.code: { stdenv, fetchurl, pkgconfig, bc, perl, pam, libXext, libXScrnSaver, libX11
  , libXrandr, libXmu, libXxf86vm, libXrender, libXxf86misc, libjpeg, mesa, gtk
  , libxml2, libglade, intltool
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:       "--with-x-app-defaults=\${out}/share/xscreensaver/app-defaults"
      ];
  
    postInstall = ''
        wrapProgram $out/bin/xscreensaver-text \
          --prefix PATH : ${stdenv.lib.makeBinPath [xorg.appres]}
    '';
  
    meta = {
      homepage = "http://www.jwz.org/xscreensaver/";
      description = "A set of screensavers";
  