From 73aea215412a8a2837292d9eac1617df7c45ef01 Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@allegro.clab.cs.cmu.edu>
Date: Mon, 25 Nov 2013 00:28:48 -0500
Subject: fix for ubuntu systems

---
 tests/tools/flex-diff.pl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tests/tools/flex-diff.pl b/tests/tools/flex-diff.pl
index 245e9a1b..30f73c4d 100755
--- a/tests/tools/flex-diff.pl
+++ b/tests/tools/flex-diff.pl
@@ -1,5 +1,8 @@
 #!/usr/bin/perl -w
 use strict;
+
+my $script_dir; BEGIN { use Cwd qw/ abs_path cwd /; use File::Basename; $script_dir = dirname(abs_path($0)); push @INC, "$script_dir/.."; }
+
 use IPC::Run3;
 
 # this file abstracts away from differences due to different hash
-- 
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