mesa OpenGL header problem with mesa > 17 on SnowLeopard (and older) -- help wanted

[Ken Cunningham]

I’m stuck, and that doesn’t happen so often to me.

Something is going on that makes mesa versions > 17 not build on 10.6 (but does on 10.7+) — some kind of redefinition hiccup. 

It is proving quite vexing.

Almost ready to throw in the towel and peg mesa at 17.x for older systems unless someone has some inspiration on what the heck is going on …

thx ken