I want to start learning how to work with fragments, and I want to install a compatibility package for versions 3.0 for Android.
However, I cannot find this package in the SDK manager. Here is all that I see:

In addition, I want to install the Action Bar Sherlock to work with Action Bars. The ACS website says: "If you use the Eclipse development environment with the ADT plugin version 0.9.7 or higher, you can enable this as a library project" -
How to enable library projects?
thanks
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