Version 1.12.0-dev.2.2
Cherry-pick 029d5c9f85dedbe8d1b4d41a8cb27d70652c9c1b to dev
diff --git a/tools/VERSION b/tools/VERSION
index 0e38057..3572a33 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -28,4 +28,4 @@
MINOR 12
PATCH 0
PRERELEASE 2
-PRERELEASE_PATCH 1
+PRERELEASE_PATCH 2
diff --git a/tools/clean_output_directory.py b/tools/clean_output_directory.py
index 79df929..f0f0426 100755
--- a/tools/clean_output_directory.py
+++ b/tools/clean_output_directory.py
@@ -5,6 +5,7 @@
# BSD-style license that can be found in the LICENSE file.
#
+import os
import shutil
import sys
import subprocess