Making a small GHC installation

Hello, Does anyone have any advice about how I might make a smallish GHC installation? The context is that I need to make a demo VM, which has a limited amount of space, and I'd like to have GHC installed on the system but the default GHC installation (~700MB) does not fit. The installation does not need to be complete---I don't need documentation, or profiling, or Template Haskell---and I only need to install a fairly limited set of libraries, just enough to build my project. I'd be happy to build a custom version of GHC, if that's the easiest way to achieve the goal. So, if you have experience doing something similar, or you know of what might be the best way to approach the problem, advice would be most welcome! -Iavor