The AVR Plugin has been successfully tested with Windows, Linux and Mac OS X.
The plugin has been tested with Eclipse 3.6 (Helios) and Eclipse 3.7 (Indigo). It may still work with Eclipse versions down to 3.4 (Ganymede), however this has not been tested and these antique Eclipse versions are not officially supported. Also the C/C++ Development Tools (CDT) Plugin is required to use the AVR Eclipse Plugin.
If you do not have Eclipse or a required version go to the eclipse.org downloads page to download the latest version. The Eclipse IDE for C/C++ Developers download package contains a suitable Eclipse IDE for running this plugin. Eclipse is self contained (does not require installation) and only needs to be unpacked.
It also needs a Java Runtime 6 (or higher).
Furthermore you need the AVR-GCC toolchain for AVR cross target development. But like the CDT Plugin for Eclipse itself, the AVR Plugin does not include a toolchain, it has to be installed separately before this plugin can be used.
If you don't have an AVR-GCC toolchain installed see here on what it is and where to get it.
There are two ways to download the AVR Eclipse Plugin. Either via the update site or by downloading the plugin manually. The first method is recommended, but you need the manual download method if you want to try out beta releases or downgrade to an older version of the plugin.
Go to the Software installation dialog (Help > Install New Software...)
Then enter the updatesite URL http://avr-eclipse.sourceforge.net/updatesite into the "Work with:" field. Select the AVR Eclipse Plugin from the list, hit "Next>" and follow the instructions on the next pages.
If you do not want to use the Eclipse update manager, you can download the plugin directly from sourceforge and install it yourself.
Go to the project download page and download the latest release from the avr-eclipse stable release Package (or from the avr-eclipse beta versions Package if you like to live on the cutting edge).
Unzipping the donloaded file is not required.
Now, in Eclipse, open the software installation dialog (Help > Install New Software...) and click on the "Add..." Button. In the new dialog hit "Archive...", select the downloaded file and click on "OK". Select the AVR Eclipse Plugin from the list, hit "Next>" and follow the instructions on the next pages.
If the installation was successful you should see the entries AVR Cross Target Application and AVR Cross Target Static Library in the "New C Project" wizard.