On QNX 6.3.2, with the io-pkt-v6-hc network driver installed, running the command ifconfig results in:

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33192
     inet 127.0.0.1 netmask 0xff000000
     inet6 ::1 prefixlen 128
     inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
en0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
     address: 00:01:f0:80:03:0b
     inet 137.19.61.100 netmask 0xfffffe00 broadcast 137.19.61.255
     inet6 fe80::201:f0ff:fe80:30b%en0 prefixlen 64 scopeid 0x2
bc0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
     ssid TST-EMBD1 nwkey 65536:"",0x6912a386e68d04f539c9ce2894d67063,0xfe374224480605fc4803f370fe34c69c,""
     powersave off
     bssid 00:1c:f0:9c:14:6b chan 6
     address: 00:21:86:3e:83:aa
     media: IEEE802.11 autoselect (OFDM54 mode 11g)
     status: active
     inet6 fe80::221:86ff:fe3e:83aa%bc0 prefixlen 64 scopeid 0x3

  ...

Here, we can clearly see the interface and link-local addresses of all 3 adapters available on the machine. In following
 code segment, I gather the interface information using the getifaddrs() method, which populates a ifaddrs struct.

  char test[INET6_ADDRSTRLEN];

  memset(test, 0, INET6_ADDRSTRLEN);

  struct ifaddrs *ifap;
  struct ifaddrs *cur = NULL;

  if (getifaddrs(&ifap) < 0)
  {
    perror("unable to retrieve interface information");
    return -1;
  }

  for (cur = ifap; cur != NULL; cur = cur->ifa_next)
  {
    //go for the first ipv6 address you find?
    //really we want the first "global" scope address...
    if (cur->ifa_addr->sa_family == AF_INET6)
    {
      struct sockaddr_in6 *addr = (struct sockaddr_in6 *)cur->ifa_addr;

      inet_ntop(AF_INET6, &addr->sin6_addr, test, INET6_ADDRSTRLEN);
      fprintf(stderr, "looking at the address: %s\n", test);
    }
  }

  freeifaddrs(ifap);

  ...

This code outputs the following:

looking at the address: ::1
looking at the address: fe80:1::1
looking at the address: fe80:2::201:f0ff:fe80:30b
looking at the address: fe80:3::221:86ff:fe3e:83aa

We can see the IPv6 link-local addresses for the adapters, but each has, what appears to be, the scope id of the address
 embedded in string. This results in an invalid link-local address. I am unaware of any error in my source, after 
reviewing several examples, and need to know if I am overlooking something.