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-rw-r--r--src/meta/window.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/meta/window.h b/src/meta/window.h
index b482bed37..7e01d191c 100644
--- a/src/meta/window.h
+++ b/src/meta/window.h
@@ -20,6 +20,10 @@
#ifndef META_WINDOW_H
#define META_WINDOW_H
+#if !defined(__META_H_INSIDE__) && !defined(MUTTER_COMPILATION)
+#error "Only <meta/meta.h> can be included directly."
+#endif
+
#include <glib-object.h>
#include <cairo.h>
#include <X11/Xlib.h>