diff --git a/compatibility_matrices/Android.mk b/compatibility_matrices/Android.mk
index 6be6930..425e376 100644
--- a/compatibility_matrices/Android.mk
+++ b/compatibility_matrices/Android.mk
@@ -17,8 +17,9 @@
 LOCAL_PATH := $(call my-dir)
 
 BUILD_FRAMEWORK_COMPATIBILITY_MATRIX := $(LOCAL_PATH)/compatibility_matrix.mk
+my_empty_manifest := $(LOCAL_PATH)/manifest.empty.xml
 
-# Framework Compatibility Matrix (common to all FCM versions)
+# System Compatibility Matrix (common to all FCM versions)
 
 include $(CLEAR_VARS)
 include $(LOCAL_PATH)/clear_vars.mk
@@ -26,6 +27,7 @@
 LOCAL_MODULE_STEM := compatibility_matrix.device.xml
 # define LOCAL_MODULE_CLASS for local-generated-sources-dir.
 LOCAL_MODULE_CLASS := ETC
+LOCAL_MODULE_RELATIVE_PATH := vintf
 
 ifndef DEVICE_FRAMEWORK_COMPATIBILITY_MATRIX_FILE
 LOCAL_SRC_FILES := compatibility_matrix.empty.xml
@@ -37,10 +39,9 @@
 # Enforce that DEVICE_FRAMEWORK_COMPATIBILITY_MATRIX_FILE does not specify required HALs
 # by checking it against an empty manifest. But the empty manifest needs to contain
 # BOARD_SEPOLICY_VERS to be compatible with DEVICE_FRAMEWORK_COMPATIBILITY_MATRIX_FILE.
-my_manifest_src_file := $(LOCAL_PATH)/manifest.empty.xml
 my_gen_check_manifest := $(local-generated-sources-dir)/manifest.check.xml
-$(my_gen_check_manifest): PRIVATE_SRC_FILE := $(my_manifest_src_file)
-$(my_gen_check_manifest): $(my_manifest_src_file) $(HOST_OUT_EXECUTABLES)/assemble_vintf
+$(my_gen_check_manifest): PRIVATE_SRC_FILE := $(my_empty_manifest)
+$(my_gen_check_manifest): $(my_empty_manifest) $(HOST_OUT_EXECUTABLES)/assemble_vintf
 	BOARD_SEPOLICY_VERS=$(BOARD_SEPOLICY_VERS) \
 	VINTF_IGNORE_TARGET_FCM_VERSION=true \
 		$(HOST_OUT_EXECUTABLES)/assemble_vintf -i $(PRIVATE_SRC_FILE) -o $@
@@ -49,7 +50,6 @@
 LOCAL_ASSEMBLE_VINTF_FLAGS += -c "$(my_gen_check_manifest)"
 
 my_gen_check_manifest :=
-my_manifest_src_file :=
 
 endif # DEVICE_FRAMEWORK_COMPATIBILITY_MATRIX_FILE
 
@@ -61,18 +61,57 @@
 
 include $(BUILD_FRAMEWORK_COMPATIBILITY_MATRIX)
 
+# Product Compatibility Matrix
+
+include $(CLEAR_VARS)
+include $(LOCAL_PATH)/clear_vars.mk
+LOCAL_MODULE := product_compatibility_matrix.xml
+
+ifndef DEVICE_PRODUCT_COMPATIBILITY_MATRIX_FILE
+my_framework_matrix_deps :=
+include $(BUILD_PHONY_PACKAGE)
+else # DEVICE_PRODUCT_COMPATIBILITY_MATRIX_FILE
+
+LOCAL_MODULE_STEM := compatibility_matrix.xml
+LOCAL_PRODUCT_MODULE := true
+LOCAL_MODULE_CLASS := ETC
+LOCAL_MODULE_RELATIVE_PATH := vintf
+
+# DEVICE_PRODUCT_COMPATIBILITY_MATRIX_FILE specify an absolute path
+LOCAL_GENERATED_SOURCES := $(DEVICE_PRODUCT_COMPATIBILITY_MATRIX_FILE)
+
+# Enforce that DEVICE_PRODUCT_COMPATIBILITY_MATRIX_FILE does not specify required HALs
+# by checking it against an empty manifest.
+LOCAL_GEN_FILE_DEPENDENCIES += $(my_empty_manifest)
+LOCAL_ASSEMBLE_VINTF_FLAGS += -c "$(my_empty_manifest)"
+
+my_framework_matrix_deps := $(LOCAL_MODULE)
+
+include $(BUILD_FRAMEWORK_COMPATIBILITY_MATRIX)
+
+endif # DEVICE_PRODUCT_COMPATIBILITY_MATRIX_FILE
+
 my_system_matrix_deps := \
     framework_compatibility_matrix.legacy.xml \
     framework_compatibility_matrix.1.xml \
     framework_compatibility_matrix.2.xml \
     framework_compatibility_matrix.3.xml \
     framework_compatibility_matrix.current.xml \
-    framework_compatibility_matrix.device.xml
+    framework_compatibility_matrix.device.xml \
 
-# Phony target that installs all framework compatibility matrix files
+my_framework_matrix_deps += \
+    $(my_system_matrix_deps)
+
+# Phony target that installs all system compatibility matrix files
+include $(CLEAR_VARS)
+LOCAL_MODULE := system_compatibility_matrix.xml
+LOCAL_REQUIRED_MODULES := $(my_system_matrix_deps)
+include $(BUILD_PHONY_PACKAGE)
+
+# Phony target that installs all framework compatibility matrix files (system + product)
 include $(CLEAR_VARS)
 LOCAL_MODULE := framework_compatibility_matrix.xml
-LOCAL_REQUIRED_MODULES := $(my_system_matrix_deps)
+LOCAL_REQUIRED_MODULES := $(my_framework_matrix_deps)
 include $(BUILD_PHONY_PACKAGE)
 
 # Final Framework Compatibility Matrix for OTA
@@ -80,7 +119,7 @@
 include $(LOCAL_PATH)/clear_vars.mk
 LOCAL_MODULE := verified_assembled_system_matrix.xml
 LOCAL_MODULE_PATH := $(PRODUCT_OUT)
-LOCAL_REQUIRED_MODULES := $(my_system_matrix_deps)
+LOCAL_REQUIRED_MODULES := $(my_framework_matrix_deps)
 LOCAL_GENERATED_SOURCES := $(call module-installed-files,$(LOCAL_REQUIRED_MODULES))
 LOCAL_ADD_VBMETA_VERSION_OVERRIDE := true
 
@@ -97,4 +136,6 @@
 BUILT_SYSTEM_MATRIX := $(LOCAL_BUILT_MODULE)
 
 my_system_matrix_deps :=
+my_framework_matrix_deps :=
+my_empty_manifest :=
 BUILD_FRAMEWORK_COMPATIBILITY_MATRIX :=
diff --git a/compatibility_matrices/CleanSpec.mk b/compatibility_matrices/CleanSpec.mk
new file mode 100644
index 0000000..9b150ed
--- /dev/null
+++ b/compatibility_matrices/CleanSpec.mk
@@ -0,0 +1,47 @@
+# Copyright 2019 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.
+#
+
+# If you don't need to do a full clean build but would like to touch
+# a file or delete some intermediate files, add a clean step to the end
+# of the list.  These steps will only be run once, if they haven't been
+# run before.
+#
+# E.g.:
+#     $(call add-clean-step, touch -c external/sqlite/sqlite3.h)
+#     $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/STATIC_LIBRARIES/libz_intermediates)
+#
+# Always use "touch -c" and "rm -f" or "rm -rf" to gracefully deal with
+# files that are missing or have been moved.
+#
+# Use $(PRODUCT_OUT) to get to the "out/target/product/blah/" directory.
+# Use $(OUT_DIR) to refer to the "out" directory.
+#
+# If you need to re-do something that's already mentioned, just copy
+# the command and add it to the bottom of the list.  E.g., if a change
+# that you made last week required touching a file and a change you
+# made today requires touching the same file, just copy the old
+# touch step and add it to the end of the list.
+#
+# ************************************************
+# NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
+# ************************************************
+
+# For example:
+#$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/AndroidTests_intermediates)
+#$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/JAVA_LIBRARIES/core_intermediates)
+#$(call add-clean-step, find $(OUT_DIR) -type f -name "IGTalkSession*" -print0 | xargs -0 rm -f)
+#$(call add-clean-step, rm -rf $(PRODUCT_OUT)/data/*)
+
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/etc/vintf/compatibility_matrix.device.xml)
diff --git a/compatibility_matrices/compatibility_matrix.mk b/compatibility_matrices/compatibility_matrix.mk
index bafc84b..d22e510 100644
--- a/compatibility_matrices/compatibility_matrix.mk
+++ b/compatibility_matrices/compatibility_matrix.mk
@@ -17,7 +17,8 @@
 ##### Input Variables:
 # LOCAL_MODULE: required. Module name for the build system.
 # LOCAL_MODULE_CLASS: optional. Default is ETC.
-# LOCAL_MODULE_PATH: optional. Path of output file. Default is $(TARGET_OUT)/etc/vintf.
+# LOCAL_MODULE_PATH / LOCAL_MODULE_RELATIVE_PATH: required. (Relative) path of output file.
+#       If not defined, LOCAL_MODULE_RELATIVE_PATH will be "vintf".
 # LOCAL_MODULE_STEM: optional. Name of output file. Default is $(LOCAL_MODULE).
 # LOCAL_SRC_FILES: required. Local source files provided to assemble_vintf
 #       (command line argument -i).
@@ -48,7 +49,9 @@
 endif
 
 ifndef LOCAL_MODULE_PATH
-LOCAL_MODULE_PATH := $(TARGET_OUT)/etc/vintf
+ifndef LOCAL_MODULE_RELATIVE_PATH
+$(error Either LOCAL_MODULE_PATH or LOCAL_MODULE_RELATIVE_PATH must be defined.)
+endif
 endif
 
 GEN := $(local-generated-sources-dir)/$(LOCAL_MODULE_STEM)