From f5a99b8660ae8039b79e2bd5b4195cba98d45cdf Mon Sep 17 00:00:00 2001
From: Stefan Behnel <scoder@users.berlios.de>
Date: Mon, 4 Oct 2010 11:40:23 +0200
Subject: [PATCH] fix PYTHONPATH setup if not previously set

---
 runtests.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/runtests.py b/runtests.py
index 7ee5650c..8d3f74e0 100644
--- a/runtests.py
+++ b/runtests.py
@@ -667,7 +667,10 @@ class EndToEndTest(unittest.TestCase):
             os.environ['PYTHONPATH'] = self.cython_root + os.pathsep + (old_path or '')
             self.assertEqual(0, os.system(commands))
         finally:
-            os.environ['PYTHONPATH'] = old_path
+            if old_path:
+                os.environ['PYTHONPATH'] = old_path
+            else:
+                del os.environ['PYTHONPATH']
 
 
 # TODO: Support cython_freeze needed here as well.
-- 
2.26.2