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Why don't just review the libraries installed on your Kindle?
You will need to either jailbreak your Kindle so you can see the system libraries;
or
Download a system update_*.bin package from Amazon for the oldest version you intend to support and open it with KindleTool;
or
Read my thread on how to install/support (concurrently) another (different) set of system libraries.
It will not be a waste of your time, you'll learn things and get access to things you will be needing.
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