Module::Install::CheckConflicts - notify users of possible conflicts with the distribution they're installing



        # Until version 0.08, Some::Module relied on a deprecated function we
        # removed now. It has been ported to the new API in 0.09.
        'Some::Module' => '0.08',



Sometimes APIs need to be broken in incompatible ways. That's fine, as long as all dependencies that relied on the old way have been updated already. If users install install a new version of your module, but aren't aware that they need to update other modules that might have been broken by that new version, they'll be left with a non-functional installation of those depending modules.

This module allows to declare modules your distribution breaks in your Makefile.PL. If a user is installing your distribution, a message explaining the situation and a list of additional modules he needs to upgrade will presented.



    check_conflicts($module => $version, ...);

Declares conflicts of your distribution. Takes a list of module/version pairs. The version number is the version of the incompatible code, not the version number of the fixed version.

If the user installing your distribution has any conflicting module installed, a warning message will be printed. That warning will contain the list of conflicts, including the installed version and the declared conflicting version.

When running the Makefile.PL from an interactive terminal, there'll be a pause of 4 seconds after print a warning, to give the user a better chance of noticing it.


Florian Ragwitz <>


Copyright (c) 2009 Florian Ragwitz

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