I would appreciate if you could send my a bug report stating the cause of the build error (the output from make will do), your perl version, OS and processor (or perl -V output).

oh, and BTW...

use Sort::Key qw(keysort);

sub mkkey {
    my $key = deaccent $_;
    $key =~ s/(?<=\d)\Q$separator\E(?>=\d)//g;
    $key =~ s{0*(\d+)}{
        my $len = length $1;
        "\x00" . ('9' x ($len / 9)) . ($len % 9) . $1
    }eg;
    $key;
}

...

cmpthese(
    -30,
    {
        #'alphanum'        => sub { @temp = sort { alphanum( $a, $b ) 
+} @array; },
        #'Sort::Naturally' => sub { @temp = nsort(@array) },
        'natural_sort'    => sub { @temp = natural_sort(@array) },
        'Sort::Key' => sub { @temp = keysort \&mkkey, @array },
    }
);
[download]

says...

78848 items in array...
             s/iter natural_sort    Sort::Key
natural_sort   3.51           --         -31%
Sort::Key      2.41          46%           --
[download]

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