I want to globally declare a variable for use as a flag in a .pov file that
includes a macro.

The macro must obviously check to see if that variable is defined, otherwise it
whines about an undefined variable when I try to check its value with an if
statement.
To head off problems, I do an ifndef(var) #local var=false #end

The problem is that there's another macro nested in the called macro.

How exactly do I declare var locally (to the main .pov file) but "globally" so
that it's recognized by the sub-macro?

Is there a proper way to do this, or do I need to declare it globally and then
undef it when I pop out of the macro?   That just seemed kludgy to me.

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