Hi,Robert!
For now OSG use old GL2 way. 
For now it nearly impossible switch it to new GL3-4 way.
Because on all vertex attributes(vertex,normals,texture coordinates) have to 
use VBO and VAO. Thats why in example I have to use EnableVBOVisitor.
So I made modifications to X11 window creation that similar to WIN32 that OSG 
uses very long time. I use define style #if defined OSG_GL3_AVAILABLE
If user want to use old GL2 way all works as I expected - I tested it. 
But theese modifications can enforce some users commits newest GL4 features. 
Cheers,
Roman

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