I compiled r10172 today, I also compiled mpc. mpc didnt work anymore, so i straced mpc, this message gets repeated:

socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = -1 EAFNOSUPPORT (Address family not supported by protocol)
socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = -1 EAFNOSUPPORT (Address family not supported by protocol)
socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = -1 EAFNOSUPPORT (Address family not supported by protocol)
socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = -1 EAFNOSUPPORT (Address family not supported by protocol)
socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = -1 EAFNOSUPPORT (Address family not supported by protocol)


I use bcm47xx, kernel 2.6. I used a mpc compiled last november, which worked like a charm. I dont use ipv6:

root@OpenWrt:/# lsmod
Module                  Size  Used by    Not tainted
usbhid                 24624  0
hid                    52256  1 usbhid
pl2303                 15312  0
mct_u232                8304  0
ftdi_sio               22864  0
belkin_sa               6288  0
usb_storage            27680  1
usbserial              24448  4 pl2303,mct_u232,ftdi_sio,belkin_sa
snd_usb_audio          57088  1
snd_usb_lib            11904  1 snd_usb_audio
evdev                   6016  0
ehci_hcd               28560  0
uhci_hcd               19792  0
input_core             18992  6 usbhid,hid,evdev
sd_mod                 18512  2
nf_nat_tftp              480  0
nf_conntrack_tftp       2480  1 nf_nat_tftp
nf_nat_irc               960  0
nf_conntrack_irc        2832  1 nf_nat_irc
nf_nat_ftp              1472  0
nf_conntrack_ftp        5152  1 nf_nat_ftp
snd_pcm_oss            40032  0
snd_mixer_oss          13728  2 snd_pcm_oss
snd_pcm                57056  2 snd_usb_audio,snd_pcm_oss
snd_timer              16144  1 snd_pcm
snd_rawmidi            16128  1 snd_usb_lib
snd_seq_device          4112  1 snd_rawmidi
snd_hwdep               4784  1 snd_usb_audio
snd_page_alloc          5168  1 snd_pcm
snd                    35280  8 snd_usb_audio,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_rawmidi,snd_seq_device,snd_hwdep
soundcore               3664  2 snd
ppp_async               9664  0
ppp_generic            20064  1 ppp_async
slhc                    5376  1 ppp_generic
crc_ccitt               1024  1 ppp_async
vfat                    8576  1
fat                    42480  1 vfat
ext3                   97840  0
jbd                    54768  1 ext3
ext2                   40240  0
b43                   107232  0
nls_utf8                 896  0
nls_iso8859_2           3392  0
nls_iso8859_15          3392  0
nls_iso8859_1           2880  1
nls_cp850               3648  0
nls_cp437               4416  1
nls_cp1250              3904  0
usbcore               106224  12 usbhid,pl2303,mct_u232,ftdi_sio,belkin_sa,usb_storage,usbserial,snd_usb_audio,snd_usb_lib,ehci_hcd,uhci_hcd
scsi_mod               71584  2 usb_storage,sd_mod
nls_base                4416  9 vfat,fat,nls_utf8,nls_iso8859_2,nls_iso8859_15,nls_iso8859_1,nls_cp850,nls_cp437,nls_cp1250
mac80211              126880  1 b43
cfg80211               16336  1 mac80211
arc4                     864  2
aes                    28240  0
deflate                 1600  0
ecb                     1440  2
cbc                     2496  0
blkcipher               3824  2 ecb,cbc
crypto_hash             1024  0
cryptomgr               1472  0
crypto_algapi           7008  6 arc4,aes,deflate,ecb,cbc,cryptomgr
switch_robo             4016  0
switch_core             5024  1 switch_robo
diag                    8400  0

I also checked dmesg for any error messages:

Jan  1 00:00:36 OpenWrt user.info : sysctl: error: 'net.ipv6.conf.all.forwarding' is an unknown key
Jan  1 00:00:35 OpenWrt daemon.info dnsmasq[957]: compile time options: IPv6 GNU-getopt ISC-leasefile no-DBus no-I18N TFTP

and I found some errors in sysctl:

root@OpenWrt:/# sysctl -a | grep error
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.icmp_errors_use_inbound_ifaddr = 0
sysctl: error: permission denied on key 'net.ipv4.route.flush'
net.ipv4.route.error_cost = 250
net.ipv4.route.error_burst = 1250
sysctl: error: 'net.ipv4.neigh.eth0.0.mcast_solicit' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.ucast_solicit' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.app_solicit' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.retrans_time' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.base_reachable_time' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.delay_first_probe_time' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.gc_stale_time' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.unres_qlen' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.proxy_qlen' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.anycast_delay' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.proxy_delay' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.locktime' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.retrans_time_ms' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.0.base_reachable_time_ms' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.mcast_solicit' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.ucast_solicit' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.app_solicit' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.retrans_time' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.base_reachable_time' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.delay_first_probe_time' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.gc_stale_time' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.unres_qlen' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.proxy_qlen' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.anycast_delay' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.proxy_delay' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.locktime' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.retrans_time_ms' is an unknown key
sysctl: error: 'net.ipv4.neigh.eth0.1.base_reachable_time_ms' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.forwarding' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.mc_forwarding' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.accept_redirects' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.secure_redirects' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.shared_media' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.rp_filter' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.send_redirects' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.accept_source_route' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.proxy_arp' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.medium_id' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.bootp_relay' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.log_martians' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.tag' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.arp_filter' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.arp_announce' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.arp_ignore' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.arp_accept' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.disable_xfrm' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.disable_policy' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.force_igmp_version' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.0.promote_secondaries' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.forwarding' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.mc_forwarding' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.accept_redirects' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.secure_redirects' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.shared_media' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.rp_filter' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.send_redirects' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.accept_source_route' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.proxy_arp' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.medium_id' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.bootp_relay' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.log_martians' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.tag' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.arp_filter' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.arp_announce' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.arp_ignore' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.arp_accept' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.disable_xfrm' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.disable_policy' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.force_igmp_version' is an unknown key
sysctl: error: 'net.ipv4.conf.eth0.1.promote_secondaries' is an unknown key

any hints about this socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = -1 EAFNOSUPPORT (Address family not supported by protocol) error?