I am trying to install the ADT Plugin. I go to Help install new software in eclipse and then after selecting the development tool I get this error
Cannot com
You need to install GEF and WST first.
GEF Update Site : http://download.eclipse.org/tools/gef/updates/releases/ (dead)
WST Update Site : http://download.eclipse.org/releases/galileo
In windows 7, choose 'Run as Administrator' when opening eclipse. This gives eclipse the permissions it needs, and should eliminate the error. This worked for the 64-bit program.
In case you can't upgrade your Eclipse (like me). Use this as a local archive to install ADT 15.0.0 which supports Eclipse 3.5.
http://dl.google.com/android/ADT-15.0.0.zip
On Ubuntu 11.10,
I downloaded Eclipse using sudo apt-get install eclipse
sudo
otherwise you will get error as mentioned by lukap)I had the same problem, run eclipse as administrator and try to instal ADT plugin again, it works.
you just need Ecplise Helios
ADT 16.0.1 (December 2011)
Dependencies:
Eclipse Helios (Version 3.6) or higher is required for ADT 16.0.1.
ADT 16.0.1 is designed for use with SDK Tools r16. If you haven't already installed SDK Tools r16 into your SDK, use the Android SDK Manager to do so.
taken from http://developer.android.com/sdk/eclipse-adt.html