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copied!<p>Is this a pure Perl module with no other dependencies?</p> <p>I'd just package it with my code. Heck, you can even just append it to your file, if you prefer.</p> <p>If this is a bit more complex, that is, there are a dozen of required modules that must be installed, and there is some compilation that is required, you'll have to use CPAN to download it. There is a <a href="http://search.cpan.org/~dons/CPAN-AutoINC-0.01/AutoINC.pm" rel="nofollow">CPAN::AutoINC</a> which is suppose to download and install any modules you need from CPAN when the module is required and not in the <code>@INC</code> path.</p> <p>However, my experience has been that you end up with a mess 'o worms. A user might start to run your program thinking it'll run for a a minute only to discover that they're spending 20 minutes downloading, compiling, and testing prerequisite modules when they really don't have time.</p> <p>It's better just to fail, and give a good explanation of what is required. The user might prefer to run <code>cpan</code> as root, so it's available for everyone on the machine. Or, maybe they need to ask a system admin to do it for them.</p> <p>I've found I can do something like this:</p> <pre><code>our $missingModuleFlag; BEGIN { eval { require My::Mod; }; our $missingModuleFlag = $@ if ($@); } [...] our $missingModuleFlag; #Package Variable -- Value is from above if ($missingModuleFlag) { die <<EOM; ERROR: You are missing module "My::Mod" which is required for this program. Please use "cpan" to download this module and install it on this server. If you have no idea what I am talking about, see http://www.cpan.org/modules/INSTALL.html. If that doesn't make any sense to you, then ask a system administrator. EOM } </code></pre> <p>It explains what is the issue, and what needs to be done and gives the user a choice to either go ahead with the install, or ask someone else to do it for them.</p>

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