Use ImportError.
diff --git a/Lib/importall.py b/Lib/importall.py
index 038b92f..57e6821 100755
--- a/Lib/importall.py
+++ b/Lib/importall.py
@@ -6,7 +6,7 @@
 	import posix
 	os = posix
 	import path
-except NameError:
+except ImportError:
 	import mac
 	os = mac
 	import macpath