[android-developers] silent install ADT eclipse plugin fails

Hi
I must be doing something wrong.
I was trying to do a silent install of the ADT plugin into Eclipse 3.7.2 . (I need to do mass-distributed install - which is why I choose command line install)
so I ran a script:
java -jar plugins/org.eclipse.equinox.launcher_1.2.0.v20110502.jar -application org.eclipse.update.core.standaloneUpdate -command install -from jar:file:/tmp/ADT-20.0.2.zip!/ -featureId com.android.ide.eclipse.adt -version 20.0.2.v201207191942-407447 -data /tmp/eclipseTest/workspace/ -consoleLog

but then eclipse returns with
Contains: Android Development Tools (20.0.2.v201207191942-407447) requires plug-in "com.android.ide.eclipse.base".
!SUBENTRY 1 org.eclipse.update.core 4 4 2012-09-30 08:51:38.673
!MESSAGE Requested operation cannot be performed because it would invalidate the current configuration. See details for more information.

so I am missing the base plugin.
does anyone know how to install the "base" using command line ? it doesn't have a "featureId" .

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