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--- a/src/query/plaintorich.h
+++ b/src/query/plaintorich.h
@@ -78,6 +78,7 @@
     virtual string endMatch() {return snull;}
     virtual string startAnchor(int) {return snull;}
     virtual string endAnchor() {return snull;}
+    virtual string startChunk() {return snull;}
 
 protected:
     static const string snull;