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diff --git a/contrib/sendmail/KNOWNBUGS b/contrib/sendmail/KNOWNBUGS
index d3c0a2ff416d..b44f931af585 100644
--- a/contrib/sendmail/KNOWNBUGS
+++ b/contrib/sendmail/KNOWNBUGS
@@ -20,6 +20,14 @@ This list is not guaranteed to be complete.
then it will be truncated which may result in a syntactically
invalid address.
+* Berkeley DB map locking problem with fcntl().
+
+ For Linux the default is to use fcntl() for file locking. However,
+ this does not work with Berkeley DB 5.x and probably later.
+ Switching to flock(), i.e., compile with -DHASFLOCK fixes this
+ (however, the have been problems with flock() on some Linux
+ versions). Alternatively, use CDB or an earlier BDB version.
+
* Delivery to programs that generate too much output may cause problems
If e-mail is delivered to a program which generates too much