diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index c3694ab2..6036bcd 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -196,6 +196,7 @@
 LOCAL_PREBUILT_OBJ_FILES:=
 LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES:=
 LOCAL_PREBUILT_STRIP_COMMENTS:=
+LOCAL_PRIVATE_PLATFORM_APIS:=
 LOCAL_PRIVILEGED_MODULE:=
 # '',full,custom,disabled,obfuscation,optimization
 LOCAL_PRODUCT_MODULE:=
diff --git a/core/host_dalvik_java_library.mk b/core/host_dalvik_java_library.mk
index 43fc780..20663d1 100644
--- a/core/host_dalvik_java_library.mk
+++ b/core/host_dalvik_java_library.mk
@@ -67,6 +67,8 @@
 
 include $(BUILD_SYSTEM)/java_common.mk
 
+include $(BUILD_SYSTEM)/sdk_check.mk
+
 $(cleantarget): PRIVATE_CLEAN_FILES += $(intermediates.COMMON)
 
 # List of dependencies for anything that needs all java sources in place
diff --git a/core/java.mk b/core/java.mk
index f92cbca..442d6cb 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -357,6 +357,8 @@
 
 include $(BUILD_SYSTEM)/java_common.mk
 
+include $(BUILD_SYSTEM)/sdk_check.mk
+
 $(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_HAS_RS_SOURCES := $(if $(renderscript_sources),true)
 $(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_RS_SOURCE_INTERMEDIATES_DIR := $(intermediates.COMMON)/renderscript
 
diff --git a/core/sdk_check.mk b/core/sdk_check.mk
new file mode 100644
index 0000000..c5c2bc8
--- /dev/null
+++ b/core/sdk_check.mk
@@ -0,0 +1,14 @@
+
+# Enforcement checks that LOCAL_SDK_VERSION and LOCAL_PRIVATE_PLATFORM_APIS are
+# set correctly.
+# Should be included by java targets that allow specifying LOCAL_SDK_VERSION.
+
+ifeq ($(LOCAL_SDK_VERSION)$(LOCAL_PRIVATE_PLATFORM_APIS),)
+ifneq ($(JAVA_SDK_ENFORCEMENT_WARNING),)
+$(warning Java modules must specify LOCAL_SDK_VERSION or LOCAL_PRIVATE_PLATFORM_APIS, but $(LOCAL_MODULE) specifies neither.)
+endif
+else ifneq ($(LOCAL_SDK_VERSION),)
+ifneq ($(LOCAL_PRIVATE_PLATFORM_APIS),)
+$(error $(LOCAL_MODULE) specifies both LOCAL_SDK_VERSION ($(LOCAL_SDK_VERSION)) and LOCAL_PRIVATE_PLATFORM_APIS ($(LOCAL_PRIVATE_PLATFORM_APIS)), but should specify only one.)
+endif
+endif