--- a/src/lib-index/mail-cache-private.h	Tue Oct 16 03:34:51 2012 +0300
+++ b/src/lib-index/mail-cache-private.h	Thu Oct 18 05:10:29 2012 +0300
@@ -256,7 +256,8 @@
 int mail_cache_lookup_iter_next(struct mail_cache_lookup_iterate_ctx *ctx,
 				struct mail_cache_iterate_field *field_r);
 
-int mail_cache_map(struct mail_cache *cache, size_t offset, size_t size);
+int mail_cache_map(struct mail_cache *cache, size_t offset, size_t size,
+		   const void **data_r);
 void mail_cache_file_close(struct mail_cache *cache);
 int mail_cache_reopen(struct mail_cache *cache);