anchor.diff:    buildInputs = [
       babl
       cairo
  -    #exiv2
  +    exiv2
       ffmpeg
       gdk-pixbuf_unwrapped
  -    #gexiv2
  +    gexiv2
       glib
       gobject-introspection
       jasper
  
positive.code:     platforms;
  
    channel = "0.3";
    version = "${channel}.14";
  in
  stdenv.mkDerivation rec {
    name = "gegl-${version}";
  
    src = fetchurl {
      url = "https://download.gimp.org/pub/gegl/${channel}/${name}.tar.bz2";
      multihash = "QmagGFqFYWtULSTjBz7j9LfDzaxLV7wb5XGwLvusznhe6K";
      hashOutput = false;
      sha256 = "09f5e2e6899697641d4660e3e274aed696f5bacc96ba389ac77674ee1156590a";
    };
  
    nativeBuildInputs = [
  
negative.code:     "--disable-workshop"
      "--${boolEn (vala != null)}-vala"
      "--without-mrg"
      "--${boolWt (gexiv2 != null)}-gexiv2"
      "--${boolWt (cairo != null)}-cairo"
      "--${boolWt (pango != null)}-pango"
      "--${boolWt (pango != null)}-pangocairo"
  