I tried the instructions listed here http://developer.android.com/sdk/installing/migrate.html#Export, including upgrading my adt plugin (I simply checked for updates in Eclipse, per http://developer.android.com/tools/help/adt.html#Updating ; it said I was up to date). But when I tried to export projects from Eclipse I don't see the "Generate Gradle build files" option, only "Export Android Application."
Is there something more that I have to do to see this option? I am using the Android Developer Tools version for Mac, Build: v21.1.0-569685.