anchor.diff:  { lib, stdenv, fetchFromGitHub, sqlite, pkg-config, autoreconfHook, pmccabe
  -, xapian, glib, gmime3, texinfo , emacs, guile
  +, xapian, glib, gmime3, texinfo, emacs, guile
   , gtk3, webkitgtk, libsoup, icu
  +, makeWrapper
   , withMug ? false
   , batchSize ? null }:
   
  
positive.code:       --replace "@abs_top_builddir@" "$out"
    '';
  
    # Install mug
    postInstall = lib.optionalString withMug ''
      for f in mug ; do
        install -m755 toys/$f/$f $out/bin/$f
      done
  
negative.code:     ++ lib.optional (!stdenv.isDarwin) guile
      ++ lib.optionals withMug [ gtk3 webkitgtk ];
  
    nativeBuildInputs = [ pkg-config autoreconfHook pmccabe makeWrapper ];
  
    enableParallelBuilding = true;
  
  