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--- a/src/rcldb/rcldb.h
+++ b/src/rcldb/rcldb.h
@@ -423,6 +423,7 @@
 extern const string pathelt_prefix;
 extern const string udi_prefix;
 extern const string parent_prefix;
+extern const string mimetype_prefix;
 #ifdef RCL_INDEX_STRIPCHARS
 extern const string start_of_field_term;
 extern const string end_of_field_term;