Minimal flags for GlGtk.area

I'm just trying to run some old LaglGTKGl code that uses:

  GlGtk.area [ `RGBA; `DOUBLEBUFFER ]

on my new Linux box and I get:

$ ./main
Xlib:  extension "RANDR" missing on display ":1.0".
The program 'main' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
  (Details: serial 152 error_code 8 request_code 148 minor_code 5)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

I had hoped that removing all the flags would leave me with minimal options 
that should work but this just seems to hit a bug in LablGTKGL:

$ ./main
Xlib:  extension "RANDR" missing on display ":1.0".
Fatal error: exception Gpointer.Null

Does anyone have any ideas what options might work?

Programs like glxgears work fine, BTW.

-- 
Dr Jon Harrop, Flying Frog Consultancy Ltd.
http://www.ffconsultancy.com/?e