I've just found out about "minimum" Windows (requires 200mb+ of disk space even with absolutely everything stripped out).
If gconf and GTK+ are just required for compilation but not for execution that's great.
To clarify - I'm trying to put a system together that consists of kernel, busybox, and any media libraries needed for sound & video. The OS and MAME will need to fit into 128MB of disk as I've got a couple of IDE flash drives lying around this size. Having libs that are essentially part of a DE on a system that will never run a DE feels unnecessary
