1gma@CPU01:~$ fgl_glxgears
Using GLX_SGIX_pbuffer
Xlib:  extension "XFree86-DRI" missing on display ":0.0".
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  143 (GLX)
  Minor opcode of failed request:  5 (X_GLXMakeCurrent)
  Serial number of failed request:  30
  Current serial number in output stream:  30
en1gma@CPU01:~$