anchor.diff:      "--enable-glibtest"
       "--disable-tests"
       "--${boolEn (gtk_2 != null)}-gtk2"
  -    "--${boolEn (gtk_3 != null)}-gtk3"
  +    "--enable-gtk3"
       "--enable-xim"
  -    "--${boolEn (wayland != null)}-wayland"
  +    "--enable-wayland"
       "--enable-appindicator"
  -    "--${boolEn (gobject-introspection != null)}-introspection"
  +    "--enable-introspection"
       "--${boolEn (vala != null)}-vala"
       "--disable-gtk-doc"
       "--disable-gtk-doc-html"
  
positive.code:   src = fetchurl {
      url = "https://github.com/ibus/ibus/releases/download/${version}/"
        + "${name}.tar.gz";
      sha256 = "8551f7d027fb65d48225642fc8f3b232412ea75a4eb375244dd72a4d73c2639e";
    };
  
    nativeBuildInputs = [
  
negative.code:   inherit (lib)
      boolEn;
  
    version = "1.5.20";
  in
  stdenv.mkDerivation rec {
    name = "ibus-${version}";
  