From bb29989cac62aaf1486b31ac2bfd5e44f2feaa0e Mon Sep 17 00:00:00 2001
From: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
Date: Mon, 6 Nov 2006 14:23:58 +0100
Subject: [PATCH] obey inheritenv variable on scons command-line (patch from
 Gustavo Carneiro)

---
 build.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/build.py b/build.py
index 461e5d8f9..cc509519a 100644
--- a/build.py
+++ b/build.py
@@ -299,7 +299,11 @@ class Ns3:
                     outfile.write('#endif /*' + config_file_guard + '*/\n')
                     config.Finish()
     def generate_dependencies(self):
-        env = Environment()
+        inheritenv = (ARGUMENTS.get('inheritenv', 'n') in 'yY1')
+        if inheritenv:
+            env = Environment(ENV=os.environ)
+        else:
+            env = Environment()
         self.gen_mod_config(env)
         cc = env['CC']
         cxx = env.subst(env['CXX'])