libxklavier: fix not finding xkbcomp (fixes NixOS#3173)

Also refactor the expression a bit,
and add description+license.

pkgs/development/libraries/libxklavier/default.nix

@@ -1,5 +1,5 @@
-{ stdenv, fetchurl, pkgconfig, libX11, libXi, xkeyboard_config, libxml2
-, libICE, glib, libxkbfile, isocodes, gobjectIntrospection }:
+{ stdenv, fetchurl, pkgconfig, xkeyboard_config, libxml2, xorg
+, glib, isocodes, gobjectIntrospection }:
 
 let
   version = "5.3";
@@ -13,18 +13,22 @@ stdenv.mkDerivation rec {
   };
 
   # TODO: enable xmodmap support, needs xmodmap DB
-  propagatedBuildInputs = [ libX11 libXi xkeyboard_config libxml2 libICE glib libxkbfile isocodes ];
+  propagatedBuildInputs = with xorg; [ libX11 libXi xkeyboard_config libxml2 libICE glib libxkbfile isocodes ];
 
   nativeBuildInputs = [ pkgconfig ];
 
   buildInputs = [ gobjectIntrospection ];
 
-  configureFlags = ''
-    --with-xkb-base=${xkeyboard_config}/etc/X11/xkb
-    --disable-xmodmap-support
-  '';
+  configureFlags = [
+    "--with-xkb-base=${xkeyboard_config}/etc/X11/xkb"
+    "--with-xkb-bin-base=${xorg.xkbcomp}/bin"
+    "--disable-xmodmap-support"
+  ];
 
-  meta = {
+  meta = with stdenv.lib; {
+    description = "Library providing high-level API for X Keyboard Extension known as XKB";
     homepage = http://freedesktop.org/wiki/Software/LibXklavier;
+    license = licenses.lgpl2Plus;
   };
 }
+