anchor.diff:    configureFlags = [
       "--disable-debug"
       "--enable-release"
  -    "--disable-native"
  +    #"--disable-native"
       (enFlag "jpeg" (libjpeg != null) null)
       #(enFlag "jp2" (openjpeg != null) null)
       (enFlag "png" (libpng != null) null)
  
positive.code: 
    src = fetchurl rec {
      url = "http://ftp.fox-toolkit.org/pub/${name}.tar.gz";
      sha1Url = url + ".sha1sum";
      sha256 = "41a03ff6a211c584e7547004002a1cfc768cdc32c84a46ec1499a4c345190885";
    };
  
    buildInputs = [
  
negative.code:     enFlag
      wtFlag;
  
    version = "1.6.51";
  in
  
  assert xorg != null ->
  