FTCBFS: does not pass --host to configure libsocket6-perl is built using a Makefile.PL that calls a ./configure script. Unfortunately, that latter invocation happens to lack --host and thus fails. Adding the --host flag is relatively easy, just figuring out the right value is not entirely obvious. I opted for $Config{archname}, which happens to be x86_64-linux-gnu-thread-multi on amd64. This is not quite what we wanted x86_64-linux-gnu, but reasonably close. It also seems to work on armhf.
IPv6 Constants missing from Socket6 The SOL_IPV6(=IPPROTO_IPV6)-level constants for setsockopt which are documented in ipv6(7) under Linux, many of which are common to other operating systems, are not defined by the Socket6 module, as they probably should.
