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Building portlet and theme projects in the Plugins SDK requires that you have a utility from Apache called Ant installed on your machine. This utility is a scriptable build tool, and it’s what the Plugins SDK uses to provide its IDE-agnosticism. After you install Ant, you’ll be able to install the Plugins SDK.
If you already have Ant installed, or if it’s built into the IDE you’ll be using (it’s on every IDE I can think of), you can skip this section.