From 6126521ff353adc35ad69fd214665ea2555059c1 Mon Sep 17 00:00:00 2001
From: Ray Speth <speth@mit.edu>
Date: Fri, 9 Aug 2013 15:35:07 +0000
Subject: [PATCH] [SCons] Eliminate spurious warnings about environment
 variables

---
 SConstruct | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/SConstruct b/SConstruct
index 21874ae15..2c3195b06 100644
--- a/SConstruct
+++ b/SConstruct
@@ -661,7 +661,7 @@ elif env['env_vars']:
     for name in env['env_vars'].split(','):
         if name in os.environ:
             env['ENV'][name] = os.environ[name]
-        else:
+        elif name not in defaults.env_vars:
             print 'WARNING: failed to propagate environment variable', name
 
 env['extra_inc_dirs'] = [d for d in env['extra_inc_dirs'].split(':') if d]