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--- a/src/ohmetacache.hxx
+++ b/src/ohmetacache.hxx
@@ -9,6 +9,7 @@
 /** 
  * Saving and restoring the metadata cache to/from disk
  */
+extern void dmcacheSetOpts(unsigned int slptime);
 extern bool dmcacheSave(const std::string& fn, const mcache_type& cache);
 extern bool dmcacheRestore(const std::string& fn, mcache_type& cache);