diff --git a/pkgs/applications/video/gnash/default.nix b/pkgs/applications/video/gnash/default.nix
index d83353af4775..05cee5cf1a74 100644
--- a/pkgs/applications/video/gnash/default.nix
+++ b/pkgs/applications/video/gnash/default.nix
@@ -1,8 +1,8 @@
-{ stdenv, fetchurl, libX11, libXext, libXi, libXmu
+{ stdenv, fetchurl
 , SDL, SDL_mixer, GStreamer
 , libogg, libxml2, libjpeg, mesa, libpng
 , boost, freetype, agg, dbus, curl, pkgconfig
-, glib, gtk
+, glib, gtk, x11
 , lib}:
 
 stdenv.mkDerivation rec {
@@ -26,11 +26,14 @@ stdenv.mkDerivation rec {
   '';
 
   # XXX: KDE is supported as well so we could make it available optionally.
-  buildInputs = [libX11 libXext libXi libXmu SDL SDL_mixer GStreamer
+  buildInputs = [x11 SDL SDL_mixer GStreamer
                  libogg libxml2 libjpeg mesa libpng boost freetype agg
 		 dbus curl pkgconfig glib gtk];
   inherit SDL_mixer SDL;
 
+  # Make sure `gtk-gnash' gets `libXext' in its `RPATH'.
+  NIX_LDFLAGS="-lX11 -lXext";
+
   preInstall = ''ensureDir $out/plugins'';
   postInstall = ''make install-plugins'';
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 47f6950cbb27..4f7750741ba9 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -5112,10 +5112,9 @@ rec {
 
   gnash = assert mesaSupported; import ../applications/video/gnash {
     inherit fetchurl stdenv SDL SDL_mixer libogg libxml2 libjpeg mesa libpng
-            boost freetype agg dbus curl pkgconfig lib;
+            boost freetype agg dbus curl pkgconfig x11 lib;
     inherit (gtkLibs) glib gtk;
     GStreamer = gst_all.gstreamer;
-    inherit (xlibs) libX11 libXext libXi libXmu;
   };
 
   gocrFun = lib.sumArgs (selectVersion ../applications/graphics/gocr "0.44") {