title: npm installing mmmagic fails
body: <p>I am attempting to install <code>mmmagic</code> however I get the following error:</p>
  
  <pre><code>npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install" "mmmagic"
  npm ERR! node v4.2.6
  npm ERR! npm  v3.5.2
  npm ERR! file sh
  npm ERR! code ELIFECYCLE
  npm ERR! errno ENOENT
  npm ERR! syscall spawn
  
  npm ERR! mmmagic@0.4.1 install: `node-gyp rebuild`
  npm ERR! spawn ENOENT
  npm ERR! 
  npm ERR! Failed at the mmmagic@0.4.1 install script 'node-gyp rebuild'.
  npm ERR! Make sure you have the latest version of node.js and npm installed.
  npm ERR! If you do, this is most likely a problem with the mmmagic package,
  npm ERR! not with npm itself.
  npm ERR! Tell the author that this fails on your system:
  npm ERR!     node-gyp rebuild
  npm ERR! You can get information on how to open an issue for this project with:
  npm ERR!     npm bugs mmmagic
  npm ERR! Or if that isn't available, you can get their info via:
  npm ERR!     npm owner ls mmmagic
  npm ERR! There is likely additional logging output above.
  
  npm ERR! Please include the following file with any support request:
  npm ERR!     /var/www/learningbankapi/src/npm-debug.log
  </code></pre>
  
  <p>I have tried to run</p>
  
  <pre><code>npm install node-gyp rebuild
  </code></pre>
  
  <p>On its own however this did not resolve the problem.</p>
  
  <p>Can anyone tell me why this is happening and how I may fix it?</p>