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--- a/src/rcldb/expansiondbs.h
+++ b/src/rcldb/expansiondbs.h
@@ -21,6 +21,8 @@
 #include <vector>
 
 #include <xapian.h>
+
+#include "unacpp.h"
 
 /** Specialization and overall creation code for the term expansion mechanism
  * defined in synfamily.h