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-rw-r--r--gtk/gtkfilesystem.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/gtk/gtkfilesystem.h b/gtk/gtkfilesystem.h
index 18ba61ca5d..ee962b2599 100644
--- a/gtk/gtkfilesystem.h
+++ b/gtk/gtkfilesystem.h
@@ -21,6 +21,14 @@
#ifndef __GTK_FILE_SYSTEM_H__
#define __GTK_FILE_SYSTEM_H__
+/* This is a "semi-private" header; it is meant only for
+ * alternate GtkFileChooser backend modules; no stability guarantees
+ * are made at this point
+ */
+#ifndef GTK_FILE_SYSTEM_ENABLE_UNSUPPORTED
+#error "GtkFileSystem is not supported API for general use"
+#endif
+
#include <glib-object.h>
#include <gtk/gtkwidget.h> /* For icon handling */