BadMatch at SGI

["Bakstein Hynek" <BAKSTEIN plk mff cuni cz>]

    Hi
    
    I have encountered some problems on SGI machines with GtkPreview. 
When I create a window with GTK it has the DEFAULT visual whis is 
PseudoColor, but GtkPreview uses the TrueColor visual. So I have 
found that I have to call:

    gtk_widget_push_visual( gtk_preview_get_visual() );
    gtk_widget_push_colormap( gtk_preview_get_cmap() );

before creating a window into which I want to put the preview. OK. 
But there could be some way to tell the program what visual it should 
use for all windows on the startup. Calling the above function does 
cause seg. fault.
    I have solved my problem but my friend is using the gtkGL widget 
and get the same BadMatch error. The above functions do not help in 
this case. any help?

                                            Hynek