If this bug is still of interest, I think a useful first step would be for someone to adapt the octave source package and add the appropriate --without-X options. Once there are proof of concept binary packages built without any graphical dependencies, then a useful disk usage comparison can be done.
Of course it would be even more helpful if someone were interested enough to help work on the full packaging changes needed to build octave both with and without all graphical libraries. I suspect an octave-nox package might also imply liboctave-noxN and liboctave-nox-dev packages, and each would have a Conflicts on its counterpart. -- mike
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