I posted this at the end of the version detection thread, but wanted to make sure everybody sees it. Maybe this can be a sticky?
For everyone having trouble running glest under linux with an ATI card here is the fix.
Before running glest do the following in a bash shell
LD_LIBRARY_PATH=/usr/lib/fglrx/lib:$LD_LIBRARY_PATH
This will allow you to run glest without any issues because it enables all of the 1.3 and extra GL extensions!!!
You don't even have to disable version detection in the ini file!
Then just run glest and enjoy!