title: How do I tell CPAN.pm to install all modules in a specific directory?
body: <p>I have set </p>
  
  <pre><code>makepl_arg         [INSTALLDIRS=site PREFIX=~/perl]
  mbuildpl_arg       [--install_base ~/perl]
  </code></pre>
  
  <p>in the CPAN.pm configuration.  I had hoped that this would cause modules to get installed in the same place, but I still have to set multiple paths in PERL5LIB:</p>
  
  <pre><code>export PERL5LIB=~/perl/share/perl/5.10.0:~/perl/lib/perl5/:~/perl/lib/perl/5.10.0
  </code></pre>
  
  <p>This has been the case for a long time and I have just lived with it, but I was wondering if anyone knew how to get CPAN.pm to put all modules in the same directory?</p>