From e70c795afc5a53dd7a6a3bcd7277d06640f24d97 Mon Sep 17 00:00:00 2001
From: Craig Dowell <craigdo@ee.washington.edu>
Date: Wed, 24 Feb 2010 11:58:24 -0800
Subject: [PATCH] fix cygwin build break

---
 src/helper/csma-helper.h           | 1 +
 src/helper/point-to-point-helper.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/src/helper/csma-helper.h b/src/helper/csma-helper.h
index 7305a6f79..67a788cf0 100644
--- a/src/helper/csma-helper.h
+++ b/src/helper/csma-helper.h
@@ -50,6 +50,7 @@ public:
    * Construct a CsmaHelper.
    */
   CsmaHelper ();
+  virtual ~CsmaHelper () {}
 
   /**
    * \param type the type of queue
diff --git a/src/helper/point-to-point-helper.h b/src/helper/point-to-point-helper.h
index afeb4c292..b3f37293a 100644
--- a/src/helper/point-to-point-helper.h
+++ b/src/helper/point-to-point-helper.h
@@ -50,6 +50,7 @@ public:
    * point networks.
    */
   PointToPointHelper ();
+  virtual ~PointToPointHelper () {}
 
   /**
    * Each point to point net device must have a queue to pass packets through.