How do i find out what configuration file XFree is currently using?

[Ævar Arnfjörð Bjarmason <jeedo@xxxxxxxxxxxxxxxxxxxxx>]

I'm making a script to collect these files, it is to run on alien machines and 
i need something more elegant than this:

"cp /etc/X11/XF86Config-4  ./etc/X11/XF86Config-4 || cp /etc/X11/XF86Config 
./etc/X11/XF86Config-4"

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