Trying to add a header file..

Hi again,
  I've created a header file for the festival speech strings, 
"speech_defs.h" and I wish to include it in three different files...
gpsdrive.c
speech_out.c
splash.c

  I've used the standard prevent multiple definition method...

#ifndef SPEECH_DEFS_H
#define SPEECH_DEFS_H

...

#endif

  However it doesn't seem to work, I'm still getting multiple 
definition errors, is there something special that needs done? I know 
very little about Makefiles, is there something to be modified there?
  You can test this problem by creating a simple '.h' file with, say, a 
string defined then include it in the above files.
--

Rob
(rob-PQdFaghcHlp/unjJdyJNww@xxxxxxxxxxxxxxxx)
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