How about "IPv6 support" Feature

# sstpc [2xxx:xxxx:xxxx:xxxx::x]

**Error: Could not lookup host: `[2xxx', (-1)

# sstpc gw-ipv6.xxx.xxx (gw-ipv6.xxx.xxx with AAAA dns record)

**Error: Could not connect to `gw-ipv6.xxx.xxx, (-1)

What's wrong with my usage?