optional ipv6 support

["Rick \"Zero_Chaos\" Farina" <zerochaos () gentoo org>]

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Currently the only ipv6 related things happening in configure.ac is this:

dnl Check IPv6 raw sending flavor.
CHECK_IPV6_IPPROTO_RAW

This means that when configure runs it checks libpcap for ipv6 support
and enables if it finds support.

For many reasons, this is not a great thing.  So call "automagic
dependencies" [1] cause a great deal of heartache when things are
rebuilt or binaries are transfered to other systems.  Would it be
possible to add --enable-ipv6 --disable-ipv6 flags like in nbase?

# Check for IPv6 support -- modified from Apache 2.0.40:

AC_ARG_ENABLE(ipv6,
  [  --disable-ipv6          Disable IPv6 support ],
  [ if test "$enableval" = "no"; then
        user_disabled_ipv6=1
    fi ],
  [ user_disabled_ipv6=0 ] )


Thanks for your consideration,

Zero


[1] http://www.gentoo.org/proj/en/qa/automagic.xml
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