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Install platform-21 manually from the ~/.meteor/android_bundle/android-sdk folder,
Set the android-targetSdkVersion preference to 21 in mobile-config.js
Create the cordova-build-override/platforms/android/ folder
Copy the project.properties from .meteor/local/cordova-build/platforms/android/ to the cordova-build-override/platforms/android/ folder
Change the android-19 in the project.properties file to android-21