libxklavier: support cross-compilation

pkgs/development/libraries/libxklavier/default.nix

@@ -1,5 +1,7 @@
 { lib, stdenv, fetchgit, autoreconfHook, pkg-config, gtk-doc, xkeyboard_config, libxml2, xorg, docbook_xsl
-, glib, isocodes, gobject-introspection }:
+, glib, isocodes, gobject-introspection
+, withDoc ? (stdenv.buildPlatform == stdenv.hostPlatform)
+}:
 
 stdenv.mkDerivation rec {
   pname = "libxklavier";
@@ -13,14 +15,12 @@ stdenv.mkDerivation rec {
 
   patches = [ ./honor-XKB_CONFIG_ROOT.patch ];
 
-  outputs = [ "out" "dev" "devdoc" ];
+  outputs = [ "out" "dev" ] ++ lib.optionals withDoc [ "devdoc" ];
 
   # TODO: enable xmodmap support, needs xmodmap DB
   propagatedBuildInputs = with xorg; [ libX11 libXi xkeyboard_config libxml2 libICE glib libxkbfile isocodes ];
 
-  nativeBuildInputs = [ autoreconfHook pkg-config gtk-doc docbook_xsl ];
-
-  buildInputs = [ gobject-introspection ];
+  nativeBuildInputs = [ autoreconfHook pkg-config gtk-doc docbook_xsl gobject-introspection ];
 
   preAutoreconf = ''
     export NOCONFIGURE=1
@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
     "--with-xkb-base=${xkeyboard_config}/etc/X11/xkb"
     "--with-xkb-bin-base=${xorg.xkbcomp}/bin"
     "--disable-xmodmap-support"
-    "--enable-gtk-doc"
+    "${if withDoc then "--enable-gtk-doc" else "--disable-gtk-doc"}"
   ];
 
   meta = with lib; {