diff --git a/lib/smux.h b/lib/smux.h
index 02e9630..dc91cac 100644
--- a/lib/smux.h
+++ b/lib/smux.h
@@ -55,8 +55,8 @@
 
 /* Declare SMUX return value. */
 #define SNMP_LOCAL_VARIABLES \
-  static long snmp_int_val; \
-  static struct in_addr snmp_in_addr_val;
+  static long snmp_int_val __attribute__ ((unused)); \
+  static struct in_addr snmp_in_addr_val __attribute__ ((unused));
 
 #define SNMP_INTEGER(V) \
   ( \
@@ -108,7 +108,7 @@
 		      const struct trap_object *, size_t,
 		      u_char);
 
-extern int oid_compare (oid *, int, oid *, int);
+extern int oid_compare (const oid *, int, const oid *, int);
 extern void oid2in_addr (oid [], int, struct in_addr *);
 extern void *oid_copy (void *, const void *, size_t);
 extern void oid_copy_addr (oid [], struct in_addr *, int);
diff --git a/lib/snmp.c b/lib/snmp.c
index 79595a1..f6f9845 100644
--- a/lib/snmp.c
+++ b/lib/snmp.c
@@ -30,7 +30,7 @@
 #define min(A,B) ((A) < (B) ? (A) : (B))
 
 int
-oid_compare (oid *o1, int o1_len, oid *o2, int o2_len)
+oid_compare (const oid *o1, int o1_len, const oid *o2, int o2_len)
 {
   int i;
 
diff --git a/ospf6d/ospf6_snmp.c b/ospf6d/ospf6_snmp.c
index 5d10ce6..ef44e4c 100644
--- a/ospf6d/ospf6_snmp.c
+++ b/ospf6d/ospf6_snmp.c
@@ -628,7 +628,6 @@
   int len;
   oid *offset;
   int offsetlen;
-  char a[16], b[16], c[16];
   struct ospf6_area *oa;
   struct listnode *node;
   struct interface *iif;
diff --git a/ospfd/ospf_snmp.c b/ospfd/ospf_snmp.c
index 7f7b157..9f91776 100644
--- a/ospfd/ospf_snmp.c
+++ b/ospfd/ospf_snmp.c
@@ -986,7 +986,7 @@
       offsetlen = *length - v->namelen;
       len = offsetlen;
 
-      if (len > IN_ADDR_SIZE)
+      if (len > (int)IN_ADDR_SIZE)
 	len = IN_ADDR_SIZE;
 
       oid2in_addr (offset, len, area_id);
@@ -1026,7 +1026,7 @@
 	  else
 	    {
 	      ls_id_next = 0;
-	      if (len > IN_ADDR_SIZE)
+	      if (len > (int)IN_ADDR_SIZE)
 		len = IN_ADDR_SIZE;
 
 	      oid2in_addr (offset, len, ls_id);
@@ -1042,7 +1042,7 @@
 	  else
 	    {
 	      router_id_next = 0;
-	      if (len > IN_ADDR_SIZE)
+	      if (len > (int)IN_ADDR_SIZE)
 		len = IN_ADDR_SIZE;
 
 	      oid2in_addr (offset, len, router_id);
@@ -1152,7 +1152,7 @@
 {
   oid *offset;
   int offsetlen;
-  unsigned int len;
+  int len;
   struct ospf *ospf;
   struct ospf_area *area;
   struct ospf_area_range *range;
@@ -1193,7 +1193,7 @@
       offsetlen = *length - v->namelen;
 
       len = offsetlen;
-      if (len > IN_ADDR_SIZE)
+      if (len > (int)IN_ADDR_SIZE)
 	len = IN_ADDR_SIZE;
 
       oid2in_addr (offset, len, area_id);
@@ -1215,7 +1215,7 @@
 
 	  if (len < 0)
 	    len = 0;
-	  if (len > IN_ADDR_SIZE)
+	  if (len > (int)IN_ADDR_SIZE)
 	    len = IN_ADDR_SIZE;
 
 	  oid2in_addr (offset, len, range_net);
diff --git a/ripd/rip_snmp.c b/ripd/rip_snmp.c
index 2df815b..2c7cd2c 100644
--- a/ripd/rip_snmp.c
+++ b/ripd/rip_snmp.c
@@ -295,7 +295,7 @@
 
       peer = rip_peer_lookup (addr);
 
-      if (peer->domain == name[v->namelen + sizeof (struct in_addr)])
+      if (peer->domain == (int)name[v->namelen + sizeof (struct in_addr)])
 	return peer;
 
       return NULL;
@@ -311,8 +311,8 @@
       peer = rip_peer_lookup (addr);
       if (peer)
 	{
-	  if ((len < sizeof (struct in_addr) + 1) ||
-	      (peer->domain > name[v->namelen + sizeof (struct in_addr)]))
+	  if ((len < (int)sizeof (struct in_addr) + 1) ||
+	      (peer->domain > (int)name[v->namelen + sizeof (struct in_addr)]))
 	    {
 	      oid_copy_addr (name + v->namelen, &peer->addr,
 			     sizeof (struct in_addr));