running celestia no longer works with software mesa. Seems to be a very recent
problem.

Using host libthread_db library "/lib/tls/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 1099703840 (LWP 1198)]
[KCrash handler]
#7  0x4180ce58 in strcmp () from /lib/tls/libc.so.6
#8  0x416d1bbf in Fake_glXChooseVisual (dpy=) at drivers/x11/fakeglx.c:964
#9  0x416cd509 in glXChooseVisual (dpy=) at drivers/x11/glxapi.c:145
#10 0x40e7cd13 in QGLContext::tryVisual () from /usr/lib/qt3/lib/libqt-mt.so.3
#11 0x40e7d021 in QGLContext::chooseVisual ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#12 0x40e7d1ec in QGLContext::chooseContext ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#13 0x40e770d9 in QGLContext::create () from /usr/lib/qt3/lib/libqt-mt.so.3
#14 0x40e7af55 in QGLWidget::setContext () from /usr/lib/qt3/lib/libqt-mt.so.3
#15 0x40e7de60 in QGLWidget::init () from /usr/lib/qt3/lib/libqt-mt.so.3
#16 0x40e790e4 in QGLWidget::QGLWidget () from /usr/lib/qt3/lib/libqt-mt.so.3
#17 0x0808f9a9 in KdeGlWidget::KdeGlWidget ()
#18 0x00000000 in ?? ()