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=head1 NAME

App::cpanminus - get, unpack, build and install modules from CPAN

=head1 SYNOPSIS

    cpanm Module

Run C<cpanm -h> or C<perldoc cpanm> for more options.

=head1 DESCRIPTION

cpanminus is a script to get, unpack, build and install modules from
CPAN and does nothing else.

It's dependency free (can bootstrap itself), requires zero
configuration, and stands alone. When running, it requires only 10MB
of RAM.

=head1 INSTALLATION

There are several ways to install cpanminus to your system.

=head2 Package management system

There are Debian packages, RPMs, FreeBSD ports, and packages for other
operation systems available. If you want to use the package management system,
search for cpanminus and use the appropriate command to install. This makes it
easy to install C<cpanm> to your system without thinking about where to
install, and later upgrade.

=head2 Installing to system perl

You can also use the latest cpanminus to install cpanminus itself:

    curl -L https://cpanmin.us | perl - --sudo App::cpanminus

This will install C<cpanm> to your bin directory like
C</usr/local/bin> and you'll need the C<--sudo> option to write to
the directory, unless you configured C<INSTALL_BASE> with L<local::lib>.

=head2 Installing to local perl (perlbrew, plenv etc.)

If you have perl in your home directory, which is the case if you use
tools like L<perlbrew> or plenv, you don't need the C<--sudo> option, since
you're most likely to have a write permission to the perl's library
path. You can just do:

    curl -L https://cpanmin.us | perl - App::cpanminus

to install the C<cpanm> executable to the perl's bin path, like
C<~/perl5/perlbrew/bin/cpanm>.

=head2 Downloading the standalone executable

You can also copy the standalone executable to whatever location you'd like.

    cd ~/bin
    curl -L https://cpanmin.us/ -o cpanm
    chmod +x cpanm

This just works, but be sure to grab the new version manually when you
upgrade because C<--self-upgrade> might not work with this installation setup.

=head2 Troubleshoot: HTTPS warnings

When you run C<curl> commands above, you may encounter SSL handshake
errors or certification warnings. This is due to your HTTP client
(curl) being old, or SSL certificates installed on your system needs
to be updated.

You're recommended to update the software or system if you can. If
that is impossible or difficult, use the C<-k> option with curl.

=head1 DEPENDENCIES

perl 5.8.1 or later.

=over 4

=item *

'tar' executable (bsdtar or GNU tar version 1.22 are recommended) or Archive::Tar to unpack files.

=item *

C compiler, if you want to build XS modules.

=item *

make

=item *

Module::Build (core in 5.10)

=back

=head1 QUESTIONS

=head2 How does cpanm get/parse/update the CPAN index?

It queries the CPAN Meta DB site at L<http://cpanmetadb.plackperl.org/>.
The site is updated at least every hour to reflect the latest changes
from fast syncing mirrors. The script then also falls back to query the
module at L<http://metacpan.org/> using its search API.

Upon calling these API hosts, cpanm (1.6004 or later) will send the
local perl versions to the server in User-Agent string by default. You
can turn it off with C<--no-report-perl-version> option. Read more
about the option with L<cpanm>, and read more about the privacy policy
about this data collection at L<http://cpanmetadb.plackperl.org/#privacy>

Fetched files are unpacked in C<~/.cpanm> and automatically cleaned up
periodically.  You can configure the location of this with the
C<PERL_CPANM_HOME> environment variable.

=head2 Where does this install modules to? Do I need root access?

It installs to wherever ExtUtils::MakeMaker and Module::Build are