Google has downloaded the Android Integrated development tool ADT, which encapsulates eclipse, but strangely enough there is no ant plugin in it.
Standard eclipse is typically built-in with Ant integrated.
And then to the Eclipse Plugins directory to see, in fact, there are installed ant plug-ins, but not reflected in the interface.
To have eclipse display ant's Configuration in the interface, you can do the following on the command line:
$ cd <your Eclipse install folder>
$./eclipse-application Org.eclipse.equinox.p2.director-repository-installiu Org.eclipse.ant.ui
Installing Org.eclipse.ant.ui 3.5.400.v20130514-1341.
When the run is complete, start eclipse, and this is when you find that ant can be displayed properly in the menu.
Note: The Windows version performs the following commands:
$ cd <your Eclipse install folder>
$ eclipse-application Org.eclipse.equinox.p2.director-repository-installiu Org.eclipse.ant.ui
Installing Org.eclipse.ant.ui 3.5.400.v20130514-1341
The Eclipse Juno version does not use Ant