diff --git a/sysdep/bsd/krt-sock.c b/sysdep/bsd/krt-sock.c
index 6f788ac2..1d0a8e1b 100644
--- a/sysdep/bsd/krt-sock.c
+++ b/sysdep/bsd/krt-sock.c
@@ -197,9 +197,9 @@ sockaddr_fill_dl(struct sockaddr_dl *sa, struct iface *ifa)
 }
 
 static int
-krt_send_route(struct krt_proto *p, int cmd, rte *e)
+krt_send_route(struct krt_proto *p, int cmd, const rte *e)
 {
-  net *net = e->net;
+  const net_addr *net = e->net;
   rta *a = e->attrs;
   static int msg_seq;
   struct iface *j, *i = a->nh.iface;
@@ -208,7 +208,7 @@ krt_send_route(struct krt_proto *p, int cmd, rte *e)
   char *body = (char *)msg.buf;
   sockaddr gate, mask, dst;
 
-  DBG("krt-sock: send %I/%d via %I\n", net->n.prefix, net->n.pxlen, a->gw);
+//  DBG("krt-sock: send %I/%d via %I\n", net->prefix, net->pxlen, a->gw);
 
   bzero(&msg,sizeof (struct rt_msghdr));
   msg.rtm.rtm_version = RTM_VERSION;
@@ -218,7 +218,7 @@ krt_send_route(struct krt_proto *p, int cmd, rte *e)
   msg.rtm.rtm_flags = RTF_UP | RTF_PROTO1;
 
   /* XXXX */
-  if (net_pxlen(net->n.addr) == net_max_prefix_length[net->n.addr->type])
+  if (net_pxlen(net) == net_max_prefix_length[net->type])
     msg.rtm.rtm_flags |= RTF_HOST;
   else
     msg.rtm.rtm_addrs |= RTA_NETMASK;
@@ -260,7 +260,7 @@ krt_send_route(struct krt_proto *p, int cmd, rte *e)
 
   int af = AF_UNSPEC;
 
-  switch (net->n.addr->type) {
+  switch (net->type) {
     case NET_IP4:
       af = AF_INET;
       break;
@@ -268,12 +268,12 @@ krt_send_route(struct krt_proto *p, int cmd, rte *e)
       af = AF_INET6;
       break;
     default:
-      log(L_ERR "KRT: Not sending route %N to kernel", net->n.addr);
+      log(L_ERR "KRT: Not sending route %N to kernel", net);
       return -1;
   }
 
-  sockaddr_fill(&dst,  af, net_prefix(net->n.addr), NULL, 0);
-  sockaddr_fill(&mask, af, net_pxmask(net->n.addr), NULL, 0);
+  sockaddr_fill(&dst,  af, net_prefix(net), NULL, 0);
+  sockaddr_fill(&mask, af, net_pxmask(net), NULL, 0);
 
   switch (a->dest)
   {
@@ -303,7 +303,7 @@ krt_send_route(struct krt_proto *p, int cmd, rte *e)
 
 #if __OpenBSD__
     /* Keeping temporarily old code for OpenBSD */
-    struct ifa *addr = (net->n.addr->type == NET_IP4) ? i->addr4 : (i->addr6 ?: i->llv6);
+    struct ifa *addr = (net->type == NET_IP4) ? i->addr4 : (i->addr6 ?: i->llv6);
 
     if (!addr)
     {
@@ -339,7 +339,7 @@ krt_send_route(struct krt_proto *p, int cmd, rte *e)
   msg.rtm.rtm_msglen = l;
 
   if ((l = write(p->sys.sk->fd, (char *)&msg, l)) < 0) {
-    log(L_ERR "KRT: Error sending route %N to kernel: %m", net->n.addr);
+    log(L_ERR "KRT: Error sending route %N to kernel: %m", net);
     return -1;
   }
 
@@ -347,7 +347,7 @@ krt_send_route(struct krt_proto *p, int cmd, rte *e)
 }
 
 void
-krt_replace_rte(struct krt_proto *p, net *n, rte *new, rte *old)
+krt_replace_rte(struct krt_proto *p, const net_addr *n UNUSED, rte *new, const rte *old)
 {
   int err = 0;
 
@@ -374,7 +374,6 @@ krt_read_route(struct ks_msg *msg, struct krt_proto *p, int scan)
   /* p is NULL iff KRT_SHARED_SOCKET and !scan */
 
   int ipv6;
-  net *net;
   sockaddr dst, gate, mask;
   ip_addr idst, igate, imask;
   net_addr ndst;
@@ -491,8 +490,6 @@ krt_read_route(struct ks_msg *msg, struct krt_proto *p, int scan)
   else
     src = KRT_SRC_KERNEL;
 
-  net = net_get(p->p.main_channel->table, &ndst);
-
   rta a = {
     .source = RTS_INHERIT,
     .scope = SCOPE_UNIVERSE,
@@ -519,7 +516,7 @@ krt_read_route(struct ks_msg *msg, struct krt_proto *p, int scan)
   if (!a.nh.iface)
     {
       log(L_ERR "KRT: Received route %N with unknown ifindex %u",
-	  net->n.addr, msg->rtm.rtm_index);
+	  &ndst, msg->rtm.rtm_index);
       return;
     }
 
@@ -542,13 +539,13 @@ krt_read_route(struct ks_msg *msg, struct krt_proto *p, int scan)
           return;
 
 	log(L_ERR "KRT: Received route %N with strange next-hop %I",
-	    net->n.addr, a.nh.gw);
+	    &ndst, a.nh.gw);
 	return;
       }
   }
 
  done:;
-  rte e0 = { .attrs = &a, .net = net, };
+  rte e0 = { .attrs = &a, .net = &ndst, };
 
   ea_list *ea = alloca(sizeof(ea_list) + 1 * sizeof(eattr));
   *ea = (ea_list) { .count = 1, .next = e0.attrs->eattrs };
diff --git a/sysdep/unix/alloc.c b/sysdep/unix/alloc.c
index 81cd19b4..24384d0e 100644
--- a/sysdep/unix/alloc.c
+++ b/sysdep/unix/alloc.c
@@ -70,10 +70,14 @@ alloc_page(void)
   else
 #endif
   {
+#ifdef HAVE_ALIGNED_ALLOC
     void *ret = aligned_alloc(page_size, page_size);
     if (!ret)
       bug("aligned_alloc(%lu) failed", page_size);
     return ret;
+#else
+    bug("BIRD should have already died on fatal error.");
+#endif
   }
 }
 
@@ -214,7 +218,11 @@ void resource_sys_init(void)
     return;
   }
 
+#ifdef HAVE_ALIGNED_ALLOC
   log(L_WARN "Got strange memory page size (%lu), using the aligned allocator instead", page_size);
+#else
+  die("Got strange memory page size (%lu) and aligned_alloc is not available", page_size);
+#endif
 
   /* Too big or strange page, use the aligned allocator instead */
   page_size = 4096;
diff --git a/sysdep/unix/krt.c b/sysdep/unix/krt.c
index c0f2e930..0cb86213 100644
--- a/sysdep/unix/krt.c
+++ b/sysdep/unix/krt.c
@@ -681,7 +681,11 @@ static int
 krt_preexport(struct channel *c, rte *e)
 {
   if (e->src->owner == &c->proto->sources)
+#ifdef CONFIG_SINGLE_ROUTE
+    return 1; /* Passing the route directly for rt_notify() to ignore */
+#else
     return -1;
+#endif
 
   if (!krt_capable(e))
     return -1;
@@ -700,13 +704,10 @@ krt_rt_notify(struct proto *P, struct channel *ch UNUSED, const net_addr *net,
 
 #ifdef CONFIG_SINGLE_ROUTE
   /*
-   * Implicit withdraw - when the imported kernel route becomes the best one,
-   * we know that the previous one exported to the kernel was already removed,
-   * but if we processed the update as usual, we would send withdraw to the
-   * kernel, which would remove the new imported route instead.
+   * When the imported kernel route becomes the best one, we get it directly and
+   * we simply know that it is already there. Nothing to do.
    */
-  rte *best = net->routes;
-  if (!new && best && (best->attrs->src->proto == P))
+  if (new->src->owner == &P->sources)
     return;
 #endif