From c544545c6364ed7081d60772505278c9f199ecf8 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 15 Dec 2011 15:45:09 -0500
Subject: KWSys: Correctly handle empty environment variables

Fix a crash which occurs when SystemTools::GetPath attempts to process
an empty environment variable.

Author: Vladimir Panteleev <vladimir@thecybershadow.net>
---
 Source/kwsys/SystemTools.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Source/kwsys/SystemTools.cxx b/Source/kwsys/SystemTools.cxx
index ed7f62c..4d83293 100644
--- a/Source/kwsys/SystemTools.cxx
+++ b/Source/kwsys/SystemTools.cxx
@@ -326,7 +326,7 @@ void SystemTools::GetPath(kwsys_stl::vector<kwsys_stl::string>& path, const char
   kwsys_stl::string pathEnv = cpathEnv;
 
   // A hack to make the below algorithm work.
-  if(pathEnv[pathEnv.length()-1] != ':')
+  if(!pathEnv.empty() && pathEnv[pathEnv.length()-1] != pathSep[0])
     {
     pathEnv += pathSep;
     }
-- 
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