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I've just extended my Net::CIDR::Lookup module with an IPv6 version and am seeing a lot of failed tests form CPANtesters. Clearly an oversight: I just assumed Socket would nowadays always export unpack_sockaddr_in6 and the like. This needs fixing but there's two things I'm not clear about:

  1. Is there a halfway easy way nowadays to find the oldest version of a module that supports a certain feature in the first place? Searching around here I found a half-decade-old thread that mentions it's a tedious process, but I knew that already :) Basically bisecting one's way through every version on BackPAN should be rather straightforward, maybe someone has written some code for it already?
  2. Now I think the IPv6-Socket problem may even be a bit more complicated as e.g. unpack_sockaddr_in6 will only actually be functional if the system had IPv6 support at XS compile time, otherwise it's there but croaks when called. I'm quite sure ExtUtils::MakeMaker has no way of checking a prerequisite for anything else but a version number, but maybe something like Module::Build does? I haven't found anything like it in the docs but I suppose something like this would make sense---a sub instead of a version that just returns a boolean indicating whether the installed version is acceptable:
    PREREQ_PM => { 'Bit::Vector' => 0, Socket => sub { eval { Socket::unpack_sockaddr_in6("\xa".("\0"x22)."\x01\0\0\ +0\0"); 1; } or do { $@ and return 0; } } },

In reply to How to require IPv6 support by mbethke

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