I'm a newbie to using IDEA and am exploring plugin development. However I'm having problems setting up the dev environment with IDEA 9.0 and the CE source, as documented here:
The steps I'm using are:
* Checkout the CE Git tree as documented here: http://www.jetbrains.org/pages/viewpage.action?pageId=983225
* Build this with Ant
* Unpack the resulting artifact to ~/idea-community
* Open IDEA Ultimate
* Go to Project Structure -> Project -> New SDK
* Add ~/idea-community
However I consistently get the error message "The selected directory is not a valid home for JSDK".
I have also seen this problem following the instructions for IDEA 8 and the dev kit, so I suspect this is a misunderstanding on my part. Any hints on what I'm doing wrong would be appreciated.