SF patch 1631942 by Collin Winter:
(a) "except E, V" -> "except E as V"
(b) V is now limited to a simple name (local variable)
(c) V is now deleted at the end of the except block
diff --git a/Lib/plat-mac/buildtools.py b/Lib/plat-mac/buildtools.py
index 7c5d0f4..4a0efbf 100644
--- a/Lib/plat-mac/buildtools.py
+++ b/Lib/plat-mac/buildtools.py
@@ -78,7 +78,7 @@
     fp.close()
     try:
         code = compile(text + '\n', filename, "exec")
-    except SyntaxError, arg:
+    except SyntaxError as arg:
         raise BuildError, "Syntax error in script %s: %s" % (filename, arg)
     except EOFError:
         raise BuildError, "End-of-file in script %s" % (filename,)