diff -r 087ce7bbac9f Lib/distutils/core.py
--- a/Lib/distutils/core.py	Fri Dec 21 09:41:25 2012 +0000
+++ b/Lib/distutils/core.py	Sun Sep 08 11:54:49 2013 +0200
@@ -208,8 +208,7 @@
     _setup_stop_after = stop_after
 
     save_argv = sys.argv
-    g = {'__file__': script_name}
-    l = {}
+    g = {'__file__': script_name, '__name__': '__main__'}
     try:
         try:
             sys.argv[0] = script_name
@@ -217,7 +216,7 @@
                 sys.argv[1:] = script_args
             f = open(script_name)
             try:
-                exec(f.read(), g, l)
+                exec(f.read(), g)
             finally:
                 f.close()
         finally:
@@ -235,7 +234,7 @@
                "perhaps '%s' is not a Distutils setup script?") % \
               script_name)
 
-    # I wonder if the setup script's namespace -- g and l -- would be of
+    # I wonder if the setup script's namespace -- g -- would be of
     # any interest to callers?
     #print "_setup_distribution:", _setup_distribution
     return _setup_distribution