--- a/src/interface.h

+++ b/src/interface.h

@@ -21,8 +21,8 @@

  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

  */

-int interface_auto_up;

-int interface_do_message;

+extern int interface_auto_up;

+extern int interface_do_message;

 typedef enum { IFSTATUS_UP, IFSTATUS_DOWN, IFSTATUS_ERR } interface_status_t;