Provided by: perl-doc_5.14.2-6ubuntu2_all bug


       inc::latest - use modules bundled in inc/ if they are newer than installed ones


         # in Build.PL
         use inc::latest 'Module::Build';


       The "inc::latest" module helps bootstrap configure-time dependencies for CPAN
       distributions.  These dependencies get bundled into the "inc" directory within a
       distribution and are used by Build.PL (or Makefile.PL).

       Arguments to "inc::latest" are module names that are checked against both the current @INC
       array and against specially-named directories in "inc".  If the bundled verison is newer
       than the installed one (or the module isn't installed, then, the bundled directory is
       added to the start of <@INC> and the module is loaded from there.

       There are actually two variations of "inc::latest" -- one for authors and one for the
       "inc" directory.  For distribution authors, the "inc::latest" installed in the system will
       record modules loaded via "inc::latest" and can be used to create the bundled files in
       "inc", including writing the second variation as "inc/".

       This second "inc::latest" is the one that is loaded in a distribution being installed
       (e.g. from Build.PL).  This bundled "inc::latest" is the one that determines which module
       to load.

   Special notes on bundling
       The "inc::latest" module creates bundled directories based on the packlist file of an
       installed distribution.  Even though "inc::latest" takes module name arguments, it is
       better to think of it as bundling and making available entire distributions.  When a
       module is loaded through "inc::latest", it looks in all bundled distributions in "inc/"
       for a newer module than can be found in the existing @INC array.

       Thus, the module-name provided should usually be the "top-level" module name of a
       distribution, though this is not strictly required.  For example, Module::Build has a
       number of heuristics to map module names to packlists, allowing users to do things like

         use inc::latest 'Devel::AssertOS::Unix';

       even though Devel::AssertOS::Unix is contained within the Devel-CheckOS distribution.

       At the current time, packlists are required.  Thus, bundling dual-core modules may require
       a 'forced install' over versions in the latest version of perl in order to create the
       necessary packlist for bundling.


       When calling "use", the bundled "inc::latest" takes a single module name and optional
       arguments to pass to that module's own import method.

         use 'inc::latest' 'Foo::Bar' qw/foo bar baz/;

       You are in author-mode inc::latest if any of the Author-mode methods are available.  For

         if ( inc::latest->can('write') ) {

             my @list = inc::latest->loaded_modules;

           This takes no arguments and always returns a list of module names requested for
           loading via "use inc::latest 'MODULE'", regardless of wether the load was successful
           or not.

             inc::latest->write( 'inc' );

           This writes the bundled version of inc::latest to the directory name given as an
           argument.  It almost all cases, it should be '"inc"'.

             for my $mod ( inc::latest->loaded_modules ) {
               inc::latest->bundle_module($mod, $dir);

           If $mod corresponds to a packlist, then this function creates a specially-named
           directory in $dir and copies all .pm files from the modlist to the new directory
           (which almost always should just be 'inc').  For example, if Foo::Bar is the name of
           the module, and $dir is 'inc', then the directory would be 'inc/inc_Foo-Bar' and
           contain files like this:


           Currently, $mod must have a packlist.  If this is not the case (e.g. for a dual-core
           module), then the bundling will fail.  You may be able to create a packlist by forced
           installing the module on top of the version that came with core Perl.

   As bundled in inc/
       All methods are private.  Only the "import" method is public.


       Eric Wilhelm <>, David Golden <>


       Copyright (c) 2009 by Eric Wilhelm and David Golden

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