modular mesa version

[Dave Airlie]

> The Modular Developers Guide says if GL support is desired then mesa 6.4
> source should be available.  Is v6.4 a strict dependency, or is anyone
> able to summarise why v6.4, rather than 6.3, say, is required?

Well the mesa 6.4 stable branch is required really, the reason being
the Xserver needs to build the Mesa source into GLcore, Mesa moves
files around between releases,.. so you need a certain version for all
the Makefiles and scripts to work..

Dave.