diff -Naur vlock-2.2.3/src/vlock.sh vlock-2.2.3.patched/src/vlock.sh
--- vlock-2.2.3/src/vlock.sh	2011-09-18 11:22:35.000000000 -0400
+++ vlock-2.2.3.patched/src/vlock.sh	2017-03-09 04:03:25.973297479 -0500
@@ -174,6 +174,7 @@
         shift
         ;;
       -t|--timeout)
+        plugins="${plugins} caca"
         VLOCK_TIMEOUT="$2"
         if ! shift 2 ; then
           echo >&2 "$0: option '$1' requires an argument"