diff --git a/build/core/apicheck.mk b/build/core/apicheck.mk
new file mode 100644
index 0000000..7b461d9
--- /dev/null
+++ b/build/core/apicheck.mk
@@ -0,0 +1,119 @@
+# Copyright (C) 2015 The CyanogenMod 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.
+
+#
+# Rules for running apicheck to confirm that you haven't broken
+# api compatibility or added apis illegally.
+#
+
+# skip api check for PDK buid
+ifeq (,$(filter true, $(WITHOUT_CHECK_API) $(TARGET_BUILD_PDK)))
+
+.PHONY: checkapi-cm
+
+# Run the checkapi rules by default.
+droidcore: checkapi-cm
+
+cm_last_released_sdk_version := $(lastword $(call numerically_sort, \
+            $(filter-out current, \
+                $(patsubst $(CM_SRC_API_DIR)/%.txt,%, $(wildcard $(CM_SRC_API_DIR)/*.txt)) \
+             )\
+        ))
+
+.PHONY: check-cm-public-api
+checkapi-cm : check-cm-public-api
+
+.PHONY: update-cm-api
+
+# INTERNAL_CM_PLATFORM_API_FILE is the one build by droiddoc.
+# Note that since INTERNAL_CM_PLATFORM_API_FILE  is the byproduct of api-stubs module,
+# (See vendor/cmsdk/Android.mk)
+# we need to add api-stubs as additional dependency of the api check.
+
+# Check that the API we're building hasn't broken the last-released
+# SDK version.
+$(eval $(call check-api, \
+    checkpublicapi-cm-last, \
+    $(CM_SRC_API_DIR)/$(cm_last_released_sdk_version).txt, \
+    $(INTERNAL_CM_PLATFORM_API_FILE), \
+    vendor/cmsdk/api/cm_removed.txt, \
+    $(INTERNAL_CM_PLATFORM_REMOVED_API_FILE), \
+    cat $(BUILD_SYSTEM)/apicheck_msg_last.txt, \
+    check-cm-public-api, \
+    $(call doc-timestamp-for, cm-api-stubs) \
+    ))
+
+
+# Check that the API we're building hasn't changed from the not-yet-released
+# SDK version.
+$(eval $(call check-api, \
+    checkpublicapi-cm-current, \
+    vendor/cmsdk/api/cm_current.txt, \
+    $(INTERNAL_CM_PLATFORM_API_FILE), \
+    vendor/cmsdk/api/cm_removed.txt, \
+    $(INTERNAL_CM_PLATFORM_REMOVED_API_FILE), \
+    cat $(BUILD_SYSTEM)/apicheck_msg_current.txt, \
+    check-cm-public-api, \
+    $(call doc-timestamp-for, cm-api-stubs) \
+    ))
+
+.PHONY: update-cm-public-api
+update-cm-public-api: $(INTERNAL_CM_PLATFORM_API_FILE) | $(ACP)
+	@echo -e ${CL_GRN}"Copying cm_current.txt"${CL_RST}
+	$(hide) $(ACP) $(INTERNAL_CM_PLATFORM_API_FILE) $(TOPDIR)vendor/cmsdk/api/cm_current.txt
+	@echo -e ${CL_GRN}"Copying cm_removed.txt"${CL_RST}
+	$(hide) $(ACP) $(INTERNAL_CM_PLATFORM_REMOVED_API_FILE) $(TOPDIR)vendor/cmsdk/api/cm_removed.txt
+
+update-cm-api : update-cm-public-api
+
+#####################Check System API#####################
+.PHONY: check-cm-system-api
+checkapi-cm : check-cm-system-api
+
+# Check that the Cyanogen System API we're building hasn't broken the last-released
+# SDK version.
+$(eval $(call check-api-cm, \
+    checksystemapi-cm-last, \
+    $(CM_SRC_SYSTEM_API_DIR)/$(cm_last_released_sdk_version).txt, \
+    $(INTERNAL_CM_PLATFORM_SYSTEM_API_FILE), \
+    vendor/cmsdk/api/cm_system-removed.txt, \
+    $(INTERNAL_CM_PLATFORM_SYSTEM_REMOVED_API_FILE), \
+    cat $(BUILD_SYSTEM)/apicheck_msg_last.txt, \
+    check-cm-system-api, \
+    $(call doc-timestamp-for, cm-system-api-stubs) \
+    ))
+
+# Check that the System API we're building hasn't changed from the not-yet-released
+# SDK version.
+$(eval $(call check-api-cm, \
+    checksystemapi-cm-current, \
+    vendor/cmsdk/api/cm_system-current.txt, \
+    $(INTERNAL_CM_PLATFORM_SYSTEM_API_FILE), \
+    vendor/cmsdk/api/cm_system-removed.txt, \
+    $(INTERNAL_CM_PLATFORM_SYSTEM_REMOVED_API_FILE), \
+    cat $(BUILD_SYSTEM)/apicheck_msg_current.txt, \
+    check-cm-system-api, \
+    $(call doc-timestamp-for, cm-system-api-stubs) \
+    ))
+
+.PHONY: update-cm-system-api
+update-cm-api : update-cm-system-api
+
+update-cm-system-api: $(INTERNAL_PLATFORM_CM_SYSTEM_API_FILE) | $(ACP)
+	@echo Copying cm_system-current.txt
+	$(hide) $(ACP) $(INTERNAL_CM_PLATFORM_SYSTEM_API_FILE) vendor/cmsdk/system-api/cm_system-current.txt
+	@echo Copying cm_system-removed.txt
+	$(hide) $(ACP) $(INTERNAL_CM_PLATFORM_SYSTEM_REMOVED_API_FILE) vendor/cmsdk/system-api/cm_system-removed.txt
+
+endif
diff --git a/build/core/config.mk b/build/core/config.mk
new file mode 100644
index 0000000..41a63b0
--- /dev/null
+++ b/build/core/config.mk
@@ -0,0 +1,6 @@
+CM_SRC_API_DIR := $(TOPDIR)vendor/cmsdk/api
+CM_SRC_SYSTEM_API_DIR := $(TOPDIR)vendor/cmsdk/system-api
+INTERNAL_CM_PLATFORM_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/cm_public_api.txt
+INTERNAL_CM_PLATFORM_REMOVED_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/cm_removed.txt
+INTERNAL_CM_PLATFORM_SYSTEM_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/cm_system-api.txt
+INTERNAL_CM_PLATFORM_SYSTEM_REMOVED_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/cm_system-removed.txt
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