startx while specifying configuration?

[William O'Higgins Witteman]

I have an nVidia-based video card.  Most of the time, I would rather use
the nouveau driver - it works, it's snappy, and it doesn't take any
hoop-jumping to "just work".  It doesn't do OpenGL, however, which I
occasionally want.  I'd like to specify with xorg.conf to use when I
startx, rather than "mv"-ing configuration files around.  Is there a way
to do this?

man startx and man xinitrc provide no guidance, and I couldn't find
anything with the aid of Google.

Thanks!
-- 

yours,

William

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