Packaging a Grafix Driver, Conflicts xlibmesa-gl

[ms419@freezone.co.uk]

Dpkg newb. here. Been installing my grafix card's closed source driver 
- ugly, ugly business. But I'm in love w/ the "Debian way", so I 
thought I'd have a go at installing it using Debian package management 
tools.

So far so good. The driver comes w/ its own "libGL.so.1.3.0" - it's 
installer ( <- I don't like the installer) *purges* all other libGL. So 
if I role a package - it's supposed to work w/ xfree86 - should I make 
it "Provides: libgl1" or "Provides: xlibmesa-gl"? Should it be 
"Conflicts: xlibmesa-gl", so xlibmesa-gl's libGL.so.1 is removed?

Thanks 4 any tips!

Jack