diff --git a/core/apicheck_msg_current.txt b/core/apicheck_msg_current.txt
index 440e7f8..9abd381 100644
--- a/core/apicheck_msg_current.txt
+++ b/core/apicheck_msg_current.txt
@@ -7,7 +7,7 @@
       errors above.
 
    2) You can update current.txt by executing the following command:
-         make update-api
+         make %UPDATE_API%
 
       To submit the revised current.txt to the main Android repository,
       you will need approval.
diff --git a/core/config.mk b/core/config.mk
index 64dc68e..c4d088d 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -43,6 +43,7 @@
 SRC_SERVERS:= $(TOPDIR)servers
 SRC_TARGET_DIR := $(TOPDIR)build/target
 SRC_API_DIR := $(TOPDIR)prebuilts/sdk/api
+SRC_SYSTEM_API_DIR := $(TOPDIR)prebuilts/sdk/system-api
 
 # Some specific paths to tools
 SRC_DROIDDOC_DIR := $(TOPDIR)build/tools/droiddoc
@@ -587,6 +588,8 @@
 
 INTERNAL_PLATFORM_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/public_api.txt
 INTERNAL_PLATFORM_REMOVED_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/removed.txt
+INTERNAL_PLATFORM_SYSTEM_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/system-api.txt
+INTERNAL_PLATFORM_SYSTEM_REMOVED_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/system-removed.txt
 
 # This is the standard way to name a directory containing prebuilt target
 # objects. E.g., prebuilt/$(TARGET_PREBUILT_TAG)/libc.so
diff --git a/core/tasks/apicheck.mk b/core/tasks/apicheck.mk
index 4711d17..fc98f5b 100644
--- a/core/tasks/apicheck.mk
+++ b/core/tasks/apicheck.mk
@@ -64,7 +64,7 @@
     -error 7 -error 8 -error 9 -error 10 -error 11 -error 12 -error 13 -error 14 -error 15 \
     -error 16 -error 17 -error 18 -error 19 -error 20 -error 21 -error 23 -error 24 \
     -error 25 -error 26 -error 27, \
-    cat $(BUILD_SYSTEM)/apicheck_msg_current.txt, \
+    sed -e 's/%UPDATE_API%/update-api/g' $(BUILD_SYSTEM)/apicheck_msg_current.txt, \
     checkapi, \
     $(call doc-timestamp-for,api-stubs) \
     ))
@@ -76,4 +76,48 @@
 	@echo Copying removed.txt
 	$(hide) $(ACP) $(INTERNAL_PLATFORM_REMOVED_API_FILE) frameworks/base/api/removed.txt
 
+
+#####################Check System API#####################
+.PHONY: checksystemapi
+
+# Check that the System API we're building hasn't broken the last-released
+# SDK version.
+$(eval $(call check-api, \
+    checksystemapi-last, \
+    $(SRC_SYSTEM_API_DIR)/$(last_released_sdk_version).txt, \
+    $(INTERNAL_PLATFORM_SYSTEM_API_FILE), \
+    frameworks/base/api/system-removed.txt, \
+    $(INTERNAL_PLATFORM_SYSTEM_REMOVED_API_FILE), \
+    -hide 2 -hide 3 -hide 4 -hide 5 -hide 6 -hide 24 -hide 25 -hide 26 -hide 27 \
+    -error 7 -error 8 -error 9 -error 10 -error 11 -error 12 -error 13 -error 14 -error 15 \
+    -error 16 -error 17 -error 18 , \
+    cat $(BUILD_SYSTEM)/apicheck_msg_last.txt, \
+    checksystemapi, \
+    $(call doc-timestamp-for,system-api-stubs) \
+    ))
+
+# Check that the System API we're building hasn't changed from the not-yet-released
+# SDK version.
+$(eval $(call check-api, \
+    checksystemapi-current, \
+    frameworks/base/api/system-current.txt, \
+    $(INTERNAL_PLATFORM_SYSTEM_API_FILE), \
+    frameworks/base/api/system-removed.txt, \
+    $(INTERNAL_PLATFORM_SYSTEM_REMOVED_API_FILE), \
+    -error 2 -error 3 -error 4 -error 5 -error 6 \
+    -error 7 -error 8 -error 9 -error 10 -error 11 -error 12 -error 13 -error 14 -error 15 \
+    -error 16 -error 17 -error 18 -error 19 -error 20 -error 21 -error 23 -error 24 \
+    -error 25 -error 26 -error 27, \
+    sed -e 's/%UPDATE_API%/update-system-api/g' $(BUILD_SYSTEM)/apicheck_msg_current.txt, \
+    checksystemapi, \
+    $(call doc-timestamp-for,system-api-stubs) \
+    ))
+
+.PHONY: update-system-api
+update-system-api: $(INTERNAL_PLATFORM_SYSTEM_API_FILE) | $(ACP)
+	@echo Copying system-current.txt
+	$(hide) $(ACP) $(INTERNAL_PLATFORM_SYSTEM_API_FILE) frameworks/base/api/system-current.txt
+	@echo Copying system-removed.txt
+	$(hide) $(ACP) $(INTERNAL_PLATFORM_SYSTEM_REMOVED_API_FILE) frameworks/base/api/system-removed.txt
+
 endif