autotools: add support for disabling async command support (--without-async/--with-async=no)

src/fifo.cpp

@@ -1,5 +1,6 @@
 /***************************************************************************
  *   Copyright (C) 2007, Gilles Casse <gcasse@oralux.org>                  *
+ *   Copyright (C) 2013 Reece H. Dunn                                      *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *
@@ -16,12 +17,9 @@
  *   Free Software Foundation, Inc.,                                       *
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  ***************************************************************************/
-#include "speech.h"
 
-#ifdef USE_ASYNC
 // This source file is only used for asynchronious modes
 
-
 //<includes
 
 #include <unistd.h>
@@ -35,6 +33,7 @@
 #include <sys/time.h>
 #include <time.h>
 
+#include "speech.h"
 #include "fifo.h"
 #include "wave.h"
 #include "debug.h"
@@ -601,7 +600,4 @@ void fifo_terminate()
 
   init(0); // purge fifo
 }
-
-#endif
 //>
-