My June assignment for The CPAN Pull Request Challenge is File::LibMagic. The module fails exclusively on OpenBSD, and the test suite never passes on it. The problem seems to be the same every time:

#   Failed test 'got expected info for symlink to PDF'
#   at t/constructor-params.t line 27.
#     Structures begin differing at:
#          $got->{mime_with_encoding} = 'application/pdf; charset=unkn
+own'
#     $expected->{mime_with_encoding} = 'application/pdf; charset=bina
+ry'
[download]

Is it just a difference between libmagic on OpenBSD and other systems? If so, could the test be fixed with

my $encoding = 'openbsd' eq $^O ? 'unknown' : 'binary';
is_deeply(
        $info, {
            description        => 'PDF document, version 1.4',
            mime_type          => 'application/pdf',
            encoding           => $encoding,
            mime_with_encoding => 'application/pdf; charset=' . $encod
+ing,
        },
        'got expected info for symlink to PDF'
    );
[download]

Or is the encoding of a PDF something that could break dependent code?

Bonus points

Some of the tests also end prematurely

error calling magic_file: zlib: (null) at /home/cpan/pit/bare/conf/per
+l-5.12.4/.cpanplus/5.12.4/build/File-LibMagic-1.12/blib/lib/File/LibM
+agic.pm line 107.
# Tests were run but no plan was declared and done_testing() was not s
+een.
# Looks like your test exited with 79 just after 2.
[download]

Again, does it mean that zlib on OpenBSD isn't installed by default, unlike other OSes? How could one solve the problem?

Answers from OpenBSD users most welcome.