Comment 26 for bug 35741

Hi Ariel, could you help to debug this further, it needs to work out
of the box rather than being solvable by a symlink! :-)

The search path for the modules is stored in the binary, this is what I get on mine:

  $ dpkg -L libgl1-mesa | xargs strings | grep /usr
  /usr/lib/dri
  /usr/share/common-licenses/LGPL.
  /usr/lib/dri

and is setup here:

  $ grep -r DEFAULT_DRIVER_DIR .
  ./configs/debian-dri: ... -DDEFAULT_DRIVER_DIR=\"/usr/lib/dri\"

But also defaults to:

  ./src/glx/x11/dri_glx.c:#define DEFAULT_DRIVER_DIR "/usr/X11R6/lib/modules/dri"

if that is not defined. It is also overriddable with setting the environment variable:

  libPaths = getenv("LIBGL_DRIVERS_PATH");

Is that that environment variable being set anywhere, or do you by chance have a custom compiled 'mesa' installed on your system?