Temporarily include config.h to make sure replaced symbols are referenced properly.

The use of config.h in example files should be reduced to minimum.

@@ -16,6 +16,9 @@
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
    MA 02110-1301 USA */
    MA 02110-1301 USA */
 
 
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif 
 #include <stdio.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdlib.h>
 #include <string.h>
 #include <string.h>