Cross-platform XCMDs?

[David Kwinter]

Thanks for the many suggestions with my recent bugs, this one however 
may be of a trickier variety.

I'm trying to make an XCMD to read the headers out of Auto-Cad standard 
.DWG files and return them as simple, delimited data.

I'm using the source code of a simple example C program - 
http://www.OpenDWG.org/ - and learning along the way - putting it into 
the shell XCMD I found in the XCMD cookbook - 
http://www.mactech.com/articles/mactech/Vol.04/04.06/XCMDCookBook/

In the code the top line of the following chunk confuses me. Is it 
possible to make a cross platform external? Does anyone know if I need 
to work with OpenDWG's C code for their Windows example program instead?

#define exampleprintf printf  /* defined as something else for Windows 
pgms */

#include "prnstuff.h"      /* this file contains routines for printing 
out */
                            /* various info being read to verify that 
the */
                            /* program is working */

#include "odio.h"

I don't see many external issues on this list, but I think this problem 
could provide some fundamental info for all. Thanks for any help.

David Kwinter
(Proud New Revolution Developer) - btw, I'd contribute more these day 
but I've been having exams.