preparatory patch for -Wwrite-strings #6
diff --git a/networking/libiproute/rtm_map.h b/networking/libiproute/rtm_map.h
index b9c8c50..cbbcc21 100644
--- a/networking/libiproute/rtm_map.h
+++ b/networking/libiproute/rtm_map.h
@@ -2,7 +2,7 @@
 #ifndef __RTM_MAP_H__
 #define __RTM_MAP_H__ 1
 
-char *rtnl_rtntype_n2a(int id, char *buf, int len);
+const char *rtnl_rtntype_n2a(int id, char *buf, int len);
 int rtnl_rtntype_a2n(int *id, char *arg);
 
 int get_rt_realms(uint32_t *realms, char *arg);