--- Configure.orig	2019-05-22 14:43:59 UTC
+++ Configure
@@ -1639,7 +1639,7 @@ kernel generation process.
     # Clear LSOF_UNSUP message for supported versions of FreeBSD.
     
     case $LSOF_VERS in  # {
-    4090|8020|8030|8040|9000|10000|11000|12000)
+    4090|8020|8030|8040|9000|10000|11000|12000|13000)
       LSOF_UNSUP=""
       ;;
     esac	# }