I'm trying to catch up with recent developments, and I've pulled and compiled 
an up-to-date snapshot today. One thing I stumbled across by accident is that 
we seem to have lost the ability to do software rendering as a fallback. If I 
start today's Flightgear binary without access to the GPU device, then I get a 
segfault immediately rather than software rendering:

NVIDIA: could not open the device file /dev/nvidiactl (Permission denied).
NVIDIA: Direct rendering failed; attempting indirect rendering.
Segmentation fault

As of two months ago, this did not occur and I got to see the no-shaders 
version of Flightgear instead. I suppose this is of no dramatic consequence in 
practice as most of us will be using hardware rendering, but it might hint at 
some underlying problem during startup.

* Thorsten

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