anchor.diff:      "--${boolWt (gdk-pixbuf != null)}-gdk-pixbuf"
       "--without-lensfun"
       "--${boolWt (librsvg != null)}-librsvg"
  -    # Requires --with-libv4l
  -    #"--${boolWt (v4l_lib != null)}-libv4l2"
  -    "--without-libv4l2"
  +    "--${boolWt (v4l_lib != null)}-libv4l2"
       "--${boolWt (openexr != null)}-openexr"
       "--without-sdl"
       "--${boolWt (libraw != null)}-libraw"
  
positive.code:     "--without-graphviz"
      "--without-lua"
      "--${boolWt (ffmpeg != null)}-libavformat"
      #"--${boolWt (v4l_lib != null)}-libv4l"
      "--without-libv4l"
      "--${boolWt (lcms2 != null)}-lcms"
      "--without-libspiro"
      "--${boolWt (exiv2 != null)}-exiv2"
  
negative.code:     platforms;
  
    channel = "0.3";
    version = "${channel}.28";
  in
  stdenv.mkDerivation rec {
    name = "gegl-${version}";
  
    src = fetchurl {
      url = "https://download.gimp.org/pub/gegl/${channel}/${name}.tar.bz2";
      multihash = "QmdEucnqs1tNDQseGH2pSozoaKwWsqiaHRNea2vWKe6qGR";
      hashOutput = false;
      sha256 = "152f87604a5a191775329dfb63764efa1d5c32403d1438da68e242f96b7d23ff";
    };
  
    nativeBuildInputs = [
  