(gdb) bt
#0  0xb77b8d2e in ?? () from /usr/lib/libGL.so.1
#1  0x0f1fee50 in ?? ()
#2  0x000000e2 in ?? ()
#3  0xb7e7f7e7 in osgViewer::PixelBufferX11::init ()
   from /usr/local/lib/libosgViewer.so.25
#4  0xb7e7fe2b in osgViewer::PixelBufferX11::PixelBufferX11 ()
   from /usr/local/lib/libosgViewer.so.25
#5  0xb7e7e3fa in X11WindowingSystemInterface::createGraphicsContext ()
   from /usr/local/lib/libosgViewer.so.25
#6  0xb79ce51d in osg::GraphicsContext::createGraphicsContext ()
   from /usr/local/lib/libosg.so.25
#7  0xb7cd2452 in osgUtil::RenderStage::runCameraSetUp ()
   from /usr/local/lib/libosgUtil.so.25
#8  0xb7cd498f in osgUtil::RenderStage::draw ()
   from /usr/local/lib/libosgUtil.so.25
#9  0xb7ccfeee in osgUtil::RenderStage::drawPreRenderStages ()
   from /usr/local/lib/libosgUtil.so.25
#10 0xb7cdf934 in osgUtil::SceneView::draw ()
   from /usr/local/lib/libosgUtil.so.25
#11 0x08069a0f in FGRenderer::update (refresh_camera_settings=true)
    at renderer.cxx:847
#12 0x080686b2 in FGRenderer::update () at renderer.hxx:41
#13 0x080ab661 in GLUTdraw () at fg_os.cxx:128
#14 0xb786f066 in ?? () from /usr/lib/libglut.so.3
#15 0x087bb138 in ?? ()
#16 0x4717a5ab in ?? ()
#17 0x000af37e in ?? ()
#18 0xb788b100 in ?? () from /usr/lib/libglut.so.3
#19 0x087bb138 in ?? ()
#20 0x00003146 in ?? ()
#21 0xbf959de8 in ?? ()
#22 0x087bb138 in ?? ()
#23 0x087bb138 in ?? ()
#24 0xb786ffc2 in glutMainLoop () from /usr/lib/libglut.so.3
#25 0xb787235e in fgEnumWindows () from /usr/lib/libglut.so.3
#26 0xb786f8c5 in glutMainLoopEvent () from /usr/lib/libglut.so.3
#27 0xb786fd55 in glutMainLoop () from /usr/lib/libglut.so.3
#28 0x0806336b in fgMainInit (argc=2, argv=0xbf95a104) at main.cxx:1075
#29 0x08061fc1 in main (argc=596879, argv=0x645f4252) at bootstrap.cxx:220