Alien::Build::Plugin::Prefer::BadVersion(3) User Contributed Perl Documentation Alien::Build::Plugin::Prefer::BadVersion(3)

Alien::Build::Plugin::Prefer::BadVersion - Plugin to filter out known bad versions

version 2.83

use alienfile;
plugin 'Prefer::BadVersion' => '1.2.3';

This plugin allows you to easily filter out known bad versions of libraries in a share install. It doesn't affect a system install at all. You need a Prefer plugin that filters and sorts files first. You may specify the filter in one of three ways:

Filter out any files that match the given version.
use alienfile;
plugin 'Prefer::BadVersion' => '1.2.3';
Filter out all files that match any of the given versions.
use alienfile;
plugin 'Prefer::BadVersion' => [ '1.2.3', '1.2.4' ];
Filter out any files return a true value.
use alienfile;
plugin 'Prefer::BadVersion' => sub {
  my($file) = @_;
  $file->{version} eq '1.2.3'; # same as the string version above

This plugin can also be used to filter out known bad versions of a library on just one platform. For example, if you know that version 1.2.3 if bad on windows, but okay on other platforms:

use alienfile;
plugin 'Prefer::BadVersion' => '1.2.3' if $^O eq 'MSWin32';

Filter out entries that match the filter.

If you are using the string or array mode, then you need an existing Prefer plugin that sets the version number for each file candidate, such as Alien::Build::Plugin::Prefer::SortVersions.

Unless you want to exclude the latest version from a share install, this plugin isn't really that useful. It has no effect on system installs, which may not be obvious at first.

Author: Graham Ollis <>


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This software is copyright (c) 2011-2022 by Graham Ollis.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

2024-06-12 perl v5.38.2