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Go to your project in the navigator, right click on properties.
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Go to the Java Build Path tab on the left.
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Go to the libraries tab on top.
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Click add external jars.
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Go to your ADT Bundle folder, go to sdk/extras/android/support/v7/appcompat/libs.
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Select the file android-support-v7-appcompat.jar
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Go to order and export and check the box next to your new jar.
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Click ok.