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--- a/src/lib/mkMake
+++ b/src/lib/mkMake
@@ -48,6 +48,7 @@
 ${depth}/rcldb/rclabstract.cpp \
 ${depth}/rcldb/rcldb.cpp \
 ${depth}/rcldb/rcldoc.cpp \
+${depth}/rcldb/rcldups.cpp \
 ${depth}/rcldb/rclquery.cpp \
 ${depth}/rcldb/rclterms.cpp \
 ${depth}/rcldb/searchdata.cpp \