Quote Originally Posted by malexander View Post
Again, wide lines are deprecated but not removed in the Core GL contexts. The GL ARB specifically mentions this in the GL 3.1 spec (Appendix G). Since the ARB went to the trouble of specifically singling out wide lines to be kept in the core profile, I somewhat doubt they'll be removed, especially since they seem to have stopped deprecating and removing features. You can use this on OSX and all other core GL implementations, unless you're adverse to using a deprecated feature.
Wide lines are not supported in OS X core profile contexts.