(In reply to comment #23)
> Thanks, but again it won't work. This time it complains about missing
> libsteam_api.so

It's possible running through apitrace is somehow losing the LD_LIBRARY_PATH
working variable or working directory. You can attach it with LD_PRELOAD which
should prevent this. Set the launch options to something like this:
LD_PRELOAD=/usr/local/lib/apitrace/wrappers/glxtrace.so:$LD_PRELOAD %command%
Adjust the path to the x86_64 glxtrace.so if necessary.