When emitting a command-line error message, *say* it's an error.

diff --git a/Lib/distutils/core.py b/Lib/distutils/core.py
index 13bf9c7fcbc899300ae406f2080b6d1c1e0e88b9..fd5ba907fb00b56e7fa66c8e3d23fe3af34831d6 100644 (file)
--- a/Lib/distutils/core.py
+++ b/Lib/distutils/core.py
@@ -88,7 +88,7 @@ def setup (**attrs):
         ok = dist.parse_command_line (sys.argv[1:])
     except DistutilsArgError, msg:
         sys.stderr.write (usage + "\n")
-        raise SystemExit, msg
+        raise SystemExit, "error: %s" % msg
 
     # And finally, run all the commands found on the command line.
     if ok: