> So what clued you on to this, Tim?  I didn't see any complaints in the pov
> output (but perhaps I missed it).

The file path provided raised an error, so I saw that
code, and remembered that you can't use concat to
form a filename in-place, it expects a literal or an
identifier, it just seemed simpler to move it.
Luck and experience I guess.

> Does this warrant a bug report?

Maybe, POV scenes should render the
same under any OS. Here's a minimal scene that
renders fine in Windows, does it work in Linux?

#version 3.6;

camera {
   location  <0.0, 0.5, -4.0>
   direction 1.5*z
   right     x*image_width/image_height
   look_at   <0.0, 0.0,  0.0>
}

light_source {
   <-30, 5, -30>
   color <1, 1, 1>
}

#declare VAR = 1;
#declare PATH = "plasma3.png";

height_field {
  #ifdef (VAR)
     png
  #else
     png
  #end
  PATH
  pigment {rgb <0,1,0>}
  translate <-0.5,0,-0.5>
  rotate <90,0,0>
  scale <2,2,1>
}

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