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When you start developing with Flex Builder 2 or 3 you’ll have possibly noticed that there is no build in ant support.

It’s really simple to install this afterwards so let’s go:

In the menu bar click on “Help -> Software Updates -> Find and Install …”:

Select “Search for new Features to install” and click “next”.

Only for Flex Builder 2:

Select “The Eclipse Project Updates” and click “Finish”

On the next screen you’ll have to select the “Java Development Tools” and click “Next”

Only for Flex Builder 3:

Select “Europa Discovery Site” (this could differ on various versions of the flex builder) and click “Finish”

On the next screen you’ll have to select the “Java Development Tools” and click “Next”

Last steps for both:

Accept the License agreement and, after downloading the stuff, click “Install All”. Then restart Flex Builder and you can run a build.xml with ant: “Run as -> Ant build”.