SDL+OpenGL+Solaris = blank window

hi!

i have compiled the sdl+opengl example from teh documentation
(http://sdldoc.csn.ul.ie/guidevideoopengl.php) on solaris9. there are no
compilation eerors and no errors during program run, but i can see nothing
except a blank window, no matter if i select SDL_FULSCREEN or not.

on linux this program works fine.
on this solaris 2d sdl programs run fine, also opengl+glut works fine.
what can be wrong?

tanks!
CeDeROM