zebra: add missing includes
diff --git a/zebra/rtread_netlink.c b/zebra/rtread_netlink.c
index 44715d9..066e844 100644
--- a/zebra/rtread_netlink.c
+++ b/zebra/rtread_netlink.c
@@ -21,6 +21,9 @@
  */
 
 #include <zebra.h>
+
+#include "zebra/zserv.h"
+
 extern void netlink_route_read (void);
 
 void route_read (void)