Index: gtk+-3.13.9/gtk/Makefile.am
===================================================================
--- gtk+-3.13.9.orig/gtk/Makefile.am
+++ gtk+-3.13.9/gtk/Makefile.am
@@ -79,7 +79,8 @@ AM_CPPFLAGS =						\
 	$(GTK_DEBUG_FLAGS)				\
 	$(GDK_HIDDEN_VISIBILITY_CFLAGS)			\
 	$(GTK_DEP_CFLAGS)				\
-	$(INCLUDED_IMMODULE_DEFINE)
+	$(INCLUDED_IMMODULE_DEFINE)			\
+	$(GDK_DEP_CFLAGS)
 
 if OS_WIN32
 gtk_def = gtk.def
Index: gtk+-3.13.9/gtk/inspector/Makefile.am
===================================================================
--- gtk+-3.13.9.orig/gtk/inspector/Makefile.am
+++ gtk+-3.13.9/gtk/inspector/Makefile.am
@@ -78,6 +78,7 @@ libgtkinspector_la_CPPFLAGS = 		\
 
 libgtkinspector_la_CFLAGS =		\
 	$(GDK_HIDDEN_VISIBILITY_CFLAGS)	\
+	$(GDK_DEP_CFLAGS)		\
 	$(GTK_DEP_CFLAGS)		\
 	$(GTK_DEBUG_FLAGS)		\
 	$(AM_CFLAGS)