Don't know if this is a bug in ssh, xcb, cairo or the demo. I haven't had time/need/interest to investigate this further. just do a 'ssh -X user@localhost' and './srtv1' to trigger the segfault
Marking as invalid as the git repository for the demo is no longer accessible, so I cannot identity the cause, and the xcb backend is currently unsupported and does not yet even pass the test suite.
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