Accessing com.intellij.openapi from Gradle based plugin project

Hi

I'm working on a Gradle-based plugin and I need to access classes in java openapi module (e.g. classes like StdModuleTypes or JavaModuleBuilder). But I don't know how to add a dependency to that module to my project. It's not part of the plugins folder in IntelliJ community, so I can't use plugins configuration of the intellij plugin in my build.gradle file. It's also not part of the ideaIC:209.2 lib that is added to the project. How can I access those classe?

Regards

Ehsan