As suggested by the error message, calling XInitThreads() before doing
any graphics (eg. at the start of main()) fixes the problem (tested in
OSG 3.2.1 branch tip, Qt 4.8).
Note however that we specifically don't do that in
osgViewer/GraphicsWindowX11.cpp; I don't know why.
Related Qt bugs:
https://bugreports.qt-project.org/browse/QTBUG-31935
https://bugreports.qt-project.org/browse/QTBUG-200
https://bugreports.qt-project.org/browse/QTBUG-24528
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