Workflow for maintaining Haskell platform packages

[Sven Panne]

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.