Are the keywords image_width and image_height functions
or variables? I had assumed that the values were set 
during the parse processes and made to be variables.
So I tried this:
#ifndef (image_width)
     #declare image_width=4;
     #declare image_height=3;
#end

And got this 
error: undeclared identifier expected but float function 
'image_width' found instead.

All the docs had said was they were keywords.

I had wanted to set the values if I were using
Official POV. Is there any way to do this?
Maybe with a check of version....

Think I found my answer. Thanks for listening.

Mr. Art

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