Thanks to everyone for the input. So this seems like a dead end for now!
But two things I can try: MESA as Aurelien suggests, and some other VM
which may support the necessary OpenGL functionality.
I'm posting here once more my system setup, just in case.
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Host: Ubuntu 12.04.2
Guest: Windows 8
OSG 3.0.1
osgSWIG cloned from the repository
VirtualBox 4.2.16, Guest Additions installed
VirtualBox settings:
3D and 2D acceleration enabled
256MB video memory (the maximum allowed)
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