--- tests/probes/interface/test_probes_interface.sh.orig	2012-04-05 14:41:53.846540789 +0200
+++ tests/probes/interface/test_probes_interface.sh	2012-04-05 14:42:41.141285232 +0200
@@ -22,6 +22,8 @@
     local DF="test_probes_interface.xml"
     local RF="results.xml"
 
+    require "ipcalc" || return 255
+
     [ -f $RF ] && rm -f $RF
 
     if [ ! -x test_probes_interface ]; then