Address family not supported by protocol

linuxGentoo

root@gbos:~# wget http://ftp.gnu.org/gnu/wget/wget-1.11.tar.gz
--04:12:31--  http://ftp.gnu.org/gnu/wget/wget-1.11.tar.gz
           => `wget-1.11.tar.gz'
Resolving ftp.gnu.org... 140.186.70.20
Connecting to ftp.gnu.org[140.186.70.20]:80... failed: Address family not supported by protocol.
Retrying.
run stace to look into:
write(2, "Connecting to ftp.gnu.org[140.18"..., 47Connecting to ftp.gnu.org[140.186.70.20]:80... ) = 47
socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = -1 EAFNOSUPPORT (Address family not supported by protocol)
write(2, "failed: Address family not suppo"..., 50failed: Address family not supported by protocol.
in my os,don't support ipv6
               
               
               

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