diff -r e0037f266d45 Lib/distutils/core.py
--- a/Lib/distutils/core.py	Fri Sep 06 06:17:15 2013 -0700
+++ b/Lib/distutils/core.py	Sat Sep 07 08:58:43 2013 +0200
@@ -209,8 +209,7 @@
     _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
@@ -218,7 +217,7 @@
                 sys.argv[1:] = script_args
             f = open(script_name)
             try:
-                exec f.read() in g, l
+                exec f.read() in g
             finally:
                 f.close()
         finally:
@@ -237,6 +236,6 @@
                "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?
     return _setup_distribution