From c6204240cb808ae37748f85637379e61a7a6d803 Mon Sep 17 00:00:00 2001
From: Vitor Santos Costa <vsc@dcc.fc.up.pt>
Date: Wed, 3 Mar 2010 22:14:42 +0000
Subject: [PATCH] fix unknown nb

---
 packages/ProbLog/problog.yap | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/ProbLog/problog.yap b/packages/ProbLog/problog.yap
index b4d353fb7..cb2e9296a 100644
--- a/packages/ProbLog/problog.yap
+++ b/packages/ProbLog/problog.yap
@@ -249,6 +249,10 @@
 :- style_check(all).
 :- yap_flag(unknown,error).
 
+:- multifile user:exception/3.
+
+user:exception(undefined_global_variable, _, fail).
+
 % problog related modules
 :- use_module('problog/flags',[set_problog_flag/2,
 	problog_flag/2,