orospakr@mithrandir:~$ gdb beryl-xgl
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This GDB was configured as "x86_64-linux-gnu"...(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(gdb) run
Starting program: /usr/bin/beryl-xgl
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XGL Present
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---Type <return> to continue, or q <return> to quit---
Program received signal SIGSEGV, Segmentation fault.
0x000000000043bba6 in glXGetConfig ()
(gdb) bt
#0 0x000000000043bba6 in glXGetConfig ()
Cannot access memory at address 0x409da960
(gdb)