Maybe I'm tired, doing it wrong - or there are errors.

In line 69 you have a capitalized inc file name, but you provide an
all-lowercase named file.

Then in line 70 you include a file - but if Granite_file isn't declared, it
throws an error - which I thought is what line 69 is for.

and _GRANITE_FILE_INC_ doesn't even exist until the file actually gets included,
so aren't you checking the wrong identifier?

Shouldn't it read something like:

#ifndef (Granite_file)
    #declare Granite_file = "dakotaredgranite.inc";
    #declare FileOK = file_exists (Granite_file);
    #if (FileOK)
        #include Granite_file
    #else error concat ("Material color_map file \"", Granite_file, "\" doesn't
exist.  Exiting."
    #end // end if
#end // end ifndef

?

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