Major Xfce refactoring, also adding versions 4.10.*

Please, comment on #296.

pkgs/development/libraries/libunique/default.nix

@@ -0,0 +1,31 @@
+{ stdenv, fetchurl, pkgconfig, glib, gtk, dbus_glib }:
+
+stdenv.mkDerivation rec {
+  name = "libunique-1.1.6";
+  src = fetchurl {
+    url = "mirror://gnome/sources/libunique/1.1/${name}.tar.bz2";
+    sha256 = "1fsgvmncd9caw552lyfg8swmsd6bh4ijjsph69bwacwfxwf09j75";
+  };
+
+  # patches from Gentoo portage
+  patches = [
+    ./1.1.6-compiler-warnings.patch
+    ./1.1.6-fix-test.patch
+    ./1.1.6-G_CONST_RETURN.patch
+    ./1.1.6-include-terminator.patch
+  ];
+
+  buildInputs = [ pkgconfig glib gtk dbus_glib ];
+
+  # don't make deprecated usages hard errors
+  preBuildPhases = "preBuild";
+  preBuild = ''substituteInPlace unique/dbus/Makefile --replace -Werror ""'';
+
+  doCheck = true;
+
+  meta = {
+    homepage = http://live.gnome.org/LibUnique;
+    description = "A library for writing single instance applications";
+    license = "LGPLv2.1";
+  };
+}