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:     (wtFlag "xfixes" (xorg != null) null)
      (wtFlag "xinput" (xorg != null) null)
      (wtFlag "xim" (xorg != null) null)
      (wtFlag "opengl" true null)
    ];
  
    doCheck = true;
  
negative.code:     enFlag
      wtFlag;
  
    version = "1.6.51";
  in
  
  assert xorg != null ->
  