In pmconfig we assert that IPv6 is always enabled for builds from PCP
3.6.11 on.
But what if the kernel does not have IPv6 support, e.g. on Gentoo
$ cat /proc/net/if_inet6
cat: /proc/net/if_inet6: No such file or directory
or the ipv6 kernel module is not loaded/built-in on Linux, or goodness
knows what on the non-Linux systems.
So in PCPland we try and make IPv6 sockets for pmcd et al and they all
fail ... this problem is is implicated in 66 of the 74 failing QA cases
for vm05 PCP 3.7.1 i486 Gentoo 2.0.3.
Seems like we need to be much smarter here (a) in the build, or (b) at
run-time or (c) both.
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