[Nix-dev] Some few more patches

[Lluís Batlle]

Hello back,

I got more things running, and here are the patches.
on wxGLCanvas, I needed this for my development with wxWidgets, so I
added the dependency on mesa. Also qt depends on mesa by default.

Regarding opera, I added a qt3gcc3 expression, without mesa (or we
would need mesa compiled with gcc33), and without mysql. Then opera
works. But installing opera throws on a precious qt3 compilation, as
that of the farm doesn't help. :)
I wasn't sure, whether to rely on opera with static qt, or this new expression.

Please accept them as you wish. Meanwhile I have opera and wxGLCanvas
working. :)

Regards,
Lluís.
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