[dialog-commodity.h] add extern "C"{}

gnucash/gnome-utils/dialog-commodity.h

@@ -37,6 +37,11 @@
 #include <gtk/gtk.h>
 #include "gnc-commodity.h"
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 /** The dialog commodity types are used to determine what commodity
  *  namespaces the currency dialog will present to a user.  These
  *  values can be safely changed from one release to the next.  Note
@@ -248,6 +253,10 @@ void gnc_ui_update_commodity_picker(GtkWidget *cbwe,
                                     const gchar *sel);
 /** @} */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif
 /** @} */
 /** @} */