title: Why can't my CPAN client from MacPorts find Module::Build?
body: <p>I am using the macports in snow leopard. I wanted to install certain perl modules to be able to run a script. The DateTime module to be exact. How do I do this? I tried using the following command.</p>
  
  <pre><code>perl -MCPAN -e shell
  cpan &gt; install DateTime
  </code></pre>
  
  <p>But it still says that DateTime.pm not found. What have I done wrong? </p>
  
  <p><strong>Edit: I think I have not configured CPAN properly. I got the error</strong></p>
  
  <pre><code>Can't locate Module/Build.pm in @INC (@INC contains: /opt/local/lib/perl5/site_perl/5.8.9/darwin-2level /opt/local/lib/perl5/site_perl/5.8.9 /opt/local/lib/perl5/site_perl /opt/local/lib/perl5/vendor_perl/5.8.9/darwin-2level /opt/local/lib/perl5/vendor_perl/5.8.9 /opt/local/lib/perl5/vendor_perl /opt/local/lib/perl5/5.8.9/darwin-2level /opt/local/lib/perl5/5.8.9 .) at Build.PL line 5.
  BEGIN failed--compilation aborted at Build.PL line 5.
  Warning: No success on command[/opt/local/bin/perl Build.PL ]
  Warning (usually harmless): 'YAML' not installed, will not store persistent state
    DROLSKY/DateTime-0.61.tar.gz
    /opt/local/bin/perl Build.PL  -- NOT OK
  Running Build test
    Make had some problems, won't test
  Running Build install
    Make had some problems, won't install
  Could not read '/Users/xxxxxx/.cpan/build/DateTime-0.61-ZNYzBn/META.yml'. Falling back to other methods to determine prerequisites
    Warning: CPAN.pm discovered Module::Build as undeclared prerequisite.
    Adding it now as such.
  </code></pre>
  
  <p>Do I need to do something else first?</p>