diff --git a/compatibility_matrices/compatibility_matrix.mk b/compatibility_matrices/compatibility_matrix.mk
new file mode 100644
index 0000000..64cd645
--- /dev/null
+++ b/compatibility_matrices/compatibility_matrix.mk
@@ -0,0 +1,94 @@
+#
+# Copyright (C) 2018 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.
+#
+
+##### Input Variables:
+# LOCAL_MODULE: required. Module name for the build system.
+# LOCAL_MODULE_CLASS: optional. Default is ETC.
+# 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 $(LOCAL_MODULE).
+# LOCAL_SRC_FILES: required. Local source files provided to assemble_vintf
+#       (command line argument -i).
+# LOCAL_GENERATED_SOURCES: optional. Global source files provided to assemble_vintf
+#       (command line argument -i).
+#
+# LOCAL_ADD_VBMETA_VERSION: Use AVBTOOL to add avb version to the output matrix
+#       (corresponds to <avb><vbmeta-version> tag)
+# LOCAL_ASSEMBLE_VINTF_ENV_VARS: Add a list of environment variable names from global variables in
+#       the build system that is lazily evaluated (e.g. PRODUCT_ENFORCE_VINTF_MANIFEST).
+# LOCAL_ASSEMBLE_VINTF_FLAGS: Add additional command line arguments to assemble_vintf invocation.
+# LOCAL_GEN_FILE_DEPENDENCIES: A list of additional dependencies for the generated file.
+
+ifndef LOCAL_MODULE
+$(error LOCAL_MODULE must be defined.)
+endif
+
+ifndef LOCAL_MODULE_STEM
+LOCAL_MODULE_STEM := $(LOCAL_MODULE)
+endif
+
+ifndef LOCAL_MODULE_CLASS
+LOCAL_MODULE_CLASS := ETC
+endif
+
+ifndef LOCAL_MODULE_PATH
+ifndef LOCAL_MODULE_RELATIVE_PATH
+$(error Either LOCAL_MODULE_PATH or LOCAL_MODULE_RELATIVE_PATH must be defined.)
+endif
+endif
+
+GEN := $(local-generated-sources-dir)/$(LOCAL_MODULE_STEM)
+
+$(GEN): PRIVATE_ENV_VARS := $(LOCAL_ASSEMBLE_VINTF_ENV_VARS)
+$(GEN): PRIVATE_FLAGS := $(LOCAL_ASSEMBLE_VINTF_FLAGS)
+
+$(GEN): $(LOCAL_GEN_FILE_DEPENDENCIES)
+
+ifeq (true,$(strip $(LOCAL_ADD_VBMETA_VERSION)))
+ifeq (true,$(BOARD_AVB_ENABLE))
+$(GEN): $(AVBTOOL)
+$(GEN): $(BOARD_AVB_SYSTEM_KEY_PATH)
+# Use deferred assignment (=) instead of immediate assignment (:=).
+# Otherwise, cannot get INTERNAL_AVB_SYSTEM_SIGNING_ARGS.
+$(GEN): FRAMEWORK_VBMETA_VERSION = $$("$(AVBTOOL)" add_hashtree_footer \
+                           --print_required_libavb_version \
+                           $(BOARD_AVB_SYSTEM_ADD_HASHTREE_FOOTER_ARGS))
+else
+$(GEN): FRAMEWORK_VBMETA_VERSION := 0.0
+endif # BOARD_AVB_ENABLE
+$(GEN): PRIVATE_ENV_VARS += FRAMEWORK_VBMETA_VERSION
+endif # LOCAL_ADD_VBMETA_VERSION
+
+my_matrix_src_files := \
+	$(addprefix $(LOCAL_PATH)/,$(LOCAL_SRC_FILES)) \
+	$(LOCAL_GENERATED_SOURCES)
+
+$(GEN): PRIVATE_SRC_FILES := $(my_matrix_src_files)
+$(GEN): $(my_matrix_src_files) $(HOST_OUT_EXECUTABLES)/assemble_vintf
+	$(foreach varname,$(PRIVATE_ENV_VARS),$(varname)="$($(varname))") \
+		$(HOST_OUT_EXECUTABLES)/assemble_vintf \
+		-i $(call normalize-path-list,$(PRIVATE_SRC_FILES)) \
+		-o $@ \
+		$(PRIVATE_FLAGS)
+
+LOCAL_PREBUILT_MODULE_FILE := $(GEN)
+LOCAL_SRC_FILES :=
+LOCAL_GENERATED_SOURCES :=
+
+include $(LOCAL_PATH)/clear_vars.mk
+my_matrix_src_files :=
+
+include $(BUILD_PREBUILT)