It is unrelated to the number of interfaces.

Breakpoint 1, getinterfaces (howmany=0xffffffffffff80cc) at tcpip.cc:2646
2646            printf("%s: not AF_INET, skipping\n", (char *)ifr);
Current language:  auto; currently c++
(gdb) print *ifr
$1 = {ifr_name = "hme0", '\0' <repeats 11 times>, ifr_ifru = {ifru_addr = {
      sa_len = 18 '\022', sa_family = 18 '\022', 
      sa_data = "\000\001\006\004\006\000hme0\b\000 |"}, ifru_dstaddr = {
      sa_len = 18 '\022', sa_family = 18 '\022', 
      sa_data = "\000\001\006\004\006\000hme0\b\000 |"}, ifru_broadaddr = {
      sa_len = 18 '\022', sa_family = 18 '\022', 
      sa_data = "\000\001\006\004\006\000hme0\b\000 |"}, ifru_space = {
      ss_len = 18 '\022', ss_family = 18 '\022', 
      __ss_pad1 = "\000\001\006\004\006", __ss_align = 7524781809373028476, 
      __ss_pad2 = "ùé\000\000\000\000\000/", '\0' <repeats 44 times>, "\022I¹\200\000\000\000\000\000\000\000\002", '\0' <repeats 15 times>, "\004", '\0' <repeats 12 times>, "\022}Ð ", '\0' <repeats 12 times>, "\022IŒü"}, 
    ifru_flags = 4626, ifru_metric = 303169537, ifru_mtu = 303169537, 
    ifru_dlt = 303169537, ifru_value = 303169537, 
    ifru_data = 0x1212000106040600, ifru_b = {b_buflen = 303169537, 
      b_buf = 0x686d65300800207c}}}

This is the struct ifreq it gets back from SIOCGIFCONF - and it skips it
because sa_family is not AF_INET.

Martin