This post falls squarely in the camp of “this was a gotcha that caught me, so I’ll blog about it so that I can Google the solution later”! 
I’m in the process of getting my head around Scala, but when installing the Scala Eclipse plugin into my standard Eclipse Europa setup, I got the message that Scala Plugin couldn’t be installed because it required “org.eclipse.pde.runtime”.
I found a few references on Google, suggesting a full installation of Eclipse (i.e not a standard install), or reverting to Eclipse 3.2.
Instead I had success by:
- Go to search for new plugins with “Help” -> “Software Updates” -> “Find and Install”
- Choose “Search for new features to install”
- Select the “The Eclipse Project Updates” repository”
- Expand the “Eclipse SDK Eclipse 3.3.1.1″ category, and select the “Eclipse Plugin Development Environment”
This plugin includes the required “org.eclipse.pde.runtime” package, so once installed you should be able to get the Scala plugin up and running.
Now all I need to do is to relearn functional programming from my Uni days… 