#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

use Unicode::Normalize qw{ NFKD NFKC };

say $^O;

my $letter = "\N{LATIN SMALL LETTER A WITH ACUTE}";

open my $out, '>', NFKD($letter) or die "Open: $!";
unlink NFKC($letter) or warn "Warn unlink: $!";
unlink NFKD($letter) or die "Unlink: $!";

##</code><code>##

linux
Warn unlink: No such file or directory at ./script.pl line 13.

##</code><code>##

darwin
Unlink: No such file or directory at ./script.pl line 14.