Index: svnadmin/hooks/scripts/stage-only.sh
===================================================================
--- svnadmin/hooks/scripts/stage-only.sh
+++ svnadmin/hooks/scripts/stage-only.sh
@@ -42,5 +42,12 @@
 			exit 1
 		fi
 	;;
+	head/*/*/distinfo*)
+		if ! svnlook cat -t ${TXN} ${REPO} $fpath | grep -q '^TIMESTAMP = [0-9]*$' ; then
+			echo "Do not commit ports without TIMESTAMP in their distinfo files." 1>&2
+			echo "Rerun make makesum to add it." 1>&2
+			exit 1
+		fi
+	;;
 	esac
 done