title: Trying to install Composer on my Mac, Brew is failing
body: <p>I am trying to install Composer to use with Laravel on my Mac and I am following all the instructions I can find, but it's still failing.</p>
  
  <p>Command: <code>php --version</code></p>
  
  <blockquote>
    <p>PHP 5.3.26 (cli) (built: Jul 7 2013 19:05:08)</p>
  </blockquote>
  
  <p>I have php installed, albeit an older version.</p>
  
  <p>Command: <code>brew install josegonzalez/php/composer</code></p>
  
  <blockquote>
    <p>composer: Missing PHP53, PHP54 or PHP55 from homebrew-php. Please install one of them before continuing</p>
  </blockquote>
  
  <p>Requires php .. mm kay fine.</p>
  
  <p>I tried installing the 53-intl that the composer documentation suggested.</p>
  
  <p>Command: <code>brew install php53-intl</code></p>
  
  <blockquote>
    <p>Error no available formula for bison27 (dependency of php53-intl)
    Searching taps...
    homebrew/versions/bison27</p>
  </blockquote>
  
  <p>It failed and I dont really understand the response.. so I'll try a new version of php.</p>
  
  <p>Command: <code>brew install php55</code></p>
  
  <blockquote>
    <p>Error: You must `brew link libpng' before php55 can be installed</p>
  </blockquote>
  
  <p>Okay.. Dependency issue.. no problem right?</p>
  
  <p>Command: <code>brew link libpng</code></p>
  
  <blockquote>
    <p>Linking /usr/local/Cellar/libpng/1.5.18... Warning: Could not link libpng. Unlinking...
    Error: Could not symlink file: /usr/local/Cellar/libpng/1.5.18/share/man/man3/libpngpf.3
    /usr/local/share/man/man3 is not writable.  You should change its permissions.</p>
  </blockquote>
  
  <p>It's 777'd.</p>
  
  <p>I'm kind of at a loss.. </p>
  
  <p>I tried unlinking and relinking libpng;
  Command: <code>brew unlink libpng</code></p>
  
  <blockquote>
    <p>Unlinking /usr/local/Cellar/libpng/1.5.18... 0 links removed</p>
  </blockquote>
  
  <p>But unlinking didnt' appear to do anything.. and linking gave same error as above.</p>
  
  <p>I have no idea how to proceed.. Thoughts?</p>