Fix failure in error handler -- exc[-1] -> exc.args[-1].
diff --git a/Lib/distutils/dir_util.py b/Lib/distutils/dir_util.py
index a6c4416..7dc1205 100644
--- a/Lib/distutils/dir_util.py
+++ b/Lib/distutils/dir_util.py
@@ -76,8 +76,8 @@
                 os.mkdir(head)
                 created_dirs.append(head)
             except OSError as exc:
-                raise DistutilsFileError, \
-                      "could not create '%s': %s" % (head, exc[-1])
+                raise DistutilsFileError(
+                      "could not create '%s': %s" % (head, exc.args[-1]))
 
         _path_created[abs_head] = 1
     return created_dirs