Build the calculator app against the SDK
diff --git a/Android.mk b/Android.mk
index b34c467..33f25da 100644
--- a/Android.mk
+++ b/Android.mk
@@ -21,6 +21,8 @@
 
 LOCAL_SRC_FILES := $(call all-java-files-under, src)
 
+LOCAL_SDK_VERSION := current
+
 LOCAL_PACKAGE_NAME := Calculator
 
 include $(BUILD_PACKAGE)