Fix broken compilation with -Wl,-z,defs -Wl,--as-needed.

configure.in.in

@@ -134,6 +134,11 @@ dnl *** Check for i18n support ***
 dnl ******************************
 XDT_I18N([@LINGUAS@])
 
+dnl *********************
+dnl *** Check for X11 ***
+dnl *********************
+XDT_CHECK_LIBX11_REQUIRE()
+
 dnl ***********************************
 dnl *** Check for required packages ***
 dnl ***********************************

plugins/thunar-wallpaper/Makefile.am

@@ -19,6 +19,7 @@ thunar_wallpaper_plugin_la_CFLAGS =					\
 	$(EXO_CFLAGS)							\
 	$(GLIB_CFLAGS)							\
 	$(GTK_CFLAGS)							\
+	$(LIBX11_CFLAGS)						\
 	$(PLATFORM_CFLAGS)
 
 thunar_wallpaper_plugin_la_LDFLAGS =					\
@@ -32,7 +33,8 @@ thunar_wallpaper_plugin_la_LIBADD =					\
 	$(top_builddir)/thunarx/libthunarx-$(THUNARX_VERSION_API).la	\
 	$(EXO_LIBS)							\
 	$(GLIB_LIBS)							\
-	$(GTK_LIBS)
+	$(GTK_LIBS)							\
+	$(LIBX11_LIBS)
 	
 thunar_wallpaper_plugin_la_DEPENDENCIES =				\
 	$(top_builddir)/thunarx/libthunarx-$(THUNARX_VERSION_API).la