my $nvsize = $Config{nvsize} ||
                ($Config{uselongdouble} && $Config{longdblsize}) ||
                 $Config{doublesize};
    die "Math::Complex: Could not figure out nvsize\n"
        unless defined $nvsize;
    die "Math::Complex: Cannot not figure out max nv (nvsize = $nvsize)\n"
        unless defined $DBL_MAX{$nvsize};
    my $DBL_MAX = eval $DBL_MAX{$nvsize};