Workflow for maintaining Haskell platform packages

Currently I'm trying to pick up my work on the OpenGL-related packages again, and while doing that, I came across some organizational difficulties: The GLUT/OpenGL/OpenGLRaw/GLURaw packages are now part of the Haskell platform (thanks to Jason and others, this is really great!), and they depend on each other, e.g. GLUT => OpenGL => OpenGLRaw. So my question is: What is the recommended workflow to easily maintain/extend packages contained in the Haskell platform? I want to be able to quickly go back to the distributed package versions, OTOH I want to relatively quickly try out new things, extend APIs, etc. for the upcoming new versions of those packages. Any hints how to do that are highly appreciated. Cheers, S.