title: Can't install Composer on Mac (Yosemite)
body: <pre><code>localhost:1nbox myusername$ sudo curl -s http://getcomposer.org/installer | phpmamp
  #!/usr/bin/env php
  All settings correct for using Composer
  PHP Fatal error:  Uncaught exception 'RuntimeException' with message 'Unable to write bundled cacert.pem to: /Users/myusername/.composer/cacert.pem' in -:403
  Stack trace:
  #0 -(112): installComposer(false, false, 'composer.phar', false, false, false)
  #1 -(14): process(Array)
  #2 {main}
    thrown in - on line 403
  localhost:1nbox myusername$ 
  </code></pre>
  
  <p>My <code>.bash_profile</code> has:</p>
  
  <pre><code>alias phpmamp='/Applications/MAMP/bin/php/php5.6.2/bin/php'
  </code></pre>