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    foreach my $name ( keys %constants ) {
        my $value = $constants{$name};

        no strict 'refs';
        defined &$name or *$name = sub () { $value };
    }

    %errstr = (
        # These strings from RFC 2553
        EAI_BADFLAGS()   => "invalid value for ai_flags",
        EAI_NONAME()     => "nodename nor servname provided, or not known",
        EAI_NODATA()     => "no address associated with nodename",
        EAI_FAMILY()     => "ai_family not supported",
        EAI_SERVICE()    => "servname not supported for ai_socktype",
    );
}

# The following functions are used if the system does not have a
# getaddrinfo(3) function in libc; and are used to emulate it for the AF_INET
# family