(gdb) bt
#0  0xb77e8d2e in ?? () from /usr/lib/libGL.so.1
#1  0x0d3fcb68 in ?? ()
#2  0x000000e2 in ?? ()
#3  0xb7eaf7e7 in osgViewer::PixelBufferX11::init ()
   from /usr/local/lib/libosgViewer.so.25
#4  0xb7eafe2b in osgViewer::PixelBufferX11::PixelBufferX11 ()
   from /usr/local/lib/libosgViewer.so.25
#5  0xb7eae3fa in X11WindowingSystemInterface::createGraphicsContext ()
   from /usr/local/lib/libosgViewer.so.25
#6  0xb79fe51d in osg::GraphicsContext::createGraphicsContext ()
   from /usr/local/lib/libosg.so.25
#7  0xb7d02452 in osgUtil::RenderStage::runCameraSetUp ()
   from /usr/local/lib/libosgUtil.so.25
#8  0xb7d0498f in osgUtil::RenderStage::draw ()
   from /usr/local/lib/libosgUtil.so.25
#9  0xb7cffeee in osgUtil::RenderStage::drawPreRenderStages ()
   from /usr/local/lib/libosgUtil.so.25
#10 0xb7d0f934 in osgUtil::SceneView::draw ()
   from /usr/local/lib/libosgUtil.so.25
#11 0xb7e6c83d in osgViewer::Renderer::cull_draw ()
   from /usr/local/lib/libosgViewer.so.25
#12 0xb7e6d703 in osgViewer::Renderer::operator() ()
   from /usr/local/lib/libosgViewer.so.25
---Type <return> to continue, or q <return> to quit---
#13 0xb7a00898 in osg::GraphicsContext::runOperations ()
   from /usr/local/lib/libosg.so.25
#14 0xb7e9fb46 in osgViewer::ViewerBase::renderingTraversals ()
   from /usr/local/lib/libosgViewer.so.25
#15 0xb7e9ed93 in osgViewer::ViewerBase::frame ()
   from /usr/local/lib/libosgViewer.so.25
#16 0xb7e9eed0 in osgViewer::ViewerBase::run ()
   from /usr/local/lib/libosgViewer.so.25
#17 0xb7e9335f in osgViewer::Viewer::run ()
   from /usr/local/lib/libosgViewer.so.25
#18 0x080b17b3 in fgOSMainLoop () at fg_os_osgviewer.cxx:239
#19 0x08064ffb in fgMainInit (argc=2, argv=0xbfcb9484) at main.cxx:1075
#20 0x08063c51 in main (argc=596879, argv=0x645f4252) at bootstrap.cxx:220