diff --git a/CleanSpec.mk b/CleanSpec.mk
index 3c8d6ce..a3b5f3c 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -374,6 +374,9 @@
 # $(PRODUCT_OUT)/recovery/root/sdcard goes from symlink to folder.
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/recovery/root/sdcard)
 
+$(call add-clean-step, rm -rf $(TARGET_OUT_COMMON_INTERMEDIATES)/APPS/previous_overlays.txt)
+$(call add-clean-step, rm -rf $(TARGET_OUT_COMMON_INTERMEDIATES)/APPS/current_packages.txt)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************
diff --git a/core/package_internal.mk b/core/package_internal.mk
index 9545823..3c3523c 100644
--- a/core/package_internal.mk
+++ b/core/package_internal.mk
@@ -597,9 +597,6 @@
 # Save information about this package
 PACKAGES.$(LOCAL_PACKAGE_NAME).OVERRIDES := $(strip $(LOCAL_OVERRIDES_PACKAGES))
 PACKAGES.$(LOCAL_PACKAGE_NAME).RESOURCE_FILES := $(all_resources)
-ifdef package_resource_overlays
-PACKAGES.$(LOCAL_PACKAGE_NAME).RESOURCE_OVERLAYS := $(package_resource_overlays)
-endif
 
 PACKAGES := $(PACKAGES) $(LOCAL_PACKAGE_NAME)
 
diff --git a/core/post_clean.mk b/core/post_clean.mk
index f08abff..d7e8322 100644
--- a/core/post_clean.mk
+++ b/core/post_clean.mk
@@ -16,44 +16,6 @@
 # This file must be included after all Android.mks have been loaded.
 
 #######################################################
-# Checks the current build configurations against the previous build,
-# clean artifacts in TARGET_COMMON_OUT_ROOT if necessary.
-# If a package's resource overlay has been changed, its R class needs to be
-# regenerated.
-previous_package_overlay_config := $(TARGET_OUT_COMMON_INTERMEDIATES)/APPS/previous_overlays.txt
-current_package_overlay_config := $(TARGET_OUT_COMMON_INTERMEDIATES)/APPS/current_overlays.txt
-current_all_packages_config := $(dir $(current_package_overlay_config))current_packages.txt
-
-$(shell rm -rf $(current_package_overlay_config) \
-    && mkdir -p $(dir $(current_package_overlay_config)) \
-    && touch $(current_package_overlay_config))
-$(shell echo '$(PACKAGES)' > $(current_all_packages_config))
-$(foreach p, $(PACKAGES), $(if $(PACKAGES.$(p).RESOURCE_OVERLAYS), \
-  $(shell echo '$(p)' '$(PACKAGES.$(p).RESOURCE_OVERLAYS)' >> $(current_package_overlay_config))))
-
-ifneq (,$(wildcard $(previous_package_overlay_config)))
-packages_overlay_changed := $(shell build/tools/diff_package_overlays.py \
-    $(current_all_packages_config) $(current_package_overlay_config) \
-    $(previous_package_overlay_config))
-ifneq (,$(packages_overlay_changed))
-overlay_cleanup_cmd := $(strip rm -rf $(foreach p, $(packages_overlay_changed),\
-    $(TARGET_OUT_COMMON_INTERMEDIATES)/APPS/$(p)_intermediates))
-$(info *** Overlay change detected, clean shared intermediate files...)
-$(info *** $(overlay_cleanup_cmd))
-$(shell $(overlay_cleanup_cmd))
-overlay_cleanup_cmd :=
-endif
-packages_overlay_changed :=
-endif
-
-# Now current becomes previous.
-$(shell mv -f $(current_package_overlay_config) $(previous_package_overlay_config))
-
-previous_package_overlay_config :=
-current_package_overlay_config :=
-current_all_packages_config :=
-
-#######################################################
 # Check if we need to delete obsolete generated java files.
 # When an aidl/proto/etc file gets deleted (or renamed), the generated java file is obsolete.
 previous_gen_java_config := $(TARGET_OUT_COMMON_INTERMEDIATES)/previous_gen_java_config.mk
diff --git a/tools/diff_package_overlays.py b/tools/diff_package_overlays.py
deleted file mode 100755
index 0e2c773..0000000
--- a/tools/diff_package_overlays.py
+++ /dev/null
@@ -1,91 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright (C) 2012 The Android Open Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""
-Prints to stdout the package names that have overlay changes between
-current_overlays.txt and previous_overlays.txt.
-
-Usage: diff_package_overlays.py <current_packages.txt> <current_overlays.txt> <previous_overlays.txt>
-current_packages.txt contains all package names separated by space in the current build.
-This script modfies current_packages.txt if necessary: if there is a package in
-previous_overlays.txt but absent from current_packages.txt, we copy that line
-from previous_overlays.txt over to current_packages.txt. Usually that means we
-just don't care that package in the current build (for example we are switching
-from a full build to a partial build with mm/mmm), and we should carry on the
-previous overlay config so current_overlays.txt always reflects the current
-status of the entire tree.
-
-Format of current_overlays.txt and previous_overlays.txt:
-  <package_name> <resource_overlay> [resource_overlay ...]
-  <package_name> <resource_overlay> [resource_overlay ...]
-  ...
-"""
-
-import sys
-
-def main(argv):
-  if len(argv) != 4:
-    print >> sys.stderr, __doc__
-    sys.exit(1)
-
-  f = open(argv[1])
-  all_packages = set(f.read().split())
-  f.close()
-
-  def load_overlay_config(filename):
-    f = open(filename)
-    result = {}
-    for line in f:
-      line = line.strip()
-      if not line or line.startswith("#"):
-        continue
-      words = line.split()
-      result[words[0]] = " ".join(words[1:])
-    f.close()
-    return result
-
-  current_overlays = load_overlay_config(argv[2])
-  previous_overlays = load_overlay_config(argv[3])
-
-  result = []
-  carryon = []
-  for p in current_overlays:
-    if p not in previous_overlays:
-      result.append(p)
-    elif current_overlays[p] != previous_overlays[p]:
-      result.append(p)
-  for p in previous_overlays:
-    if p not in current_overlays:
-      if p in all_packages:
-        # overlay changed
-        result.append(p)
-      else:
-        # we don't build p in the current build.
-        carryon.append(p)
-
-  # Add carryon to the current overlay config file.
-  if carryon:
-    f = open(argv[2], "a")
-    for p in carryon:
-      f.write(p + " " + previous_overlays[p] + "\n")
-    f.close()
-
-  # Print out the package names that have overlay change.
-  for r in result:
-    print r
-
-if __name__ == "__main__":
-  main(sys.argv)