title: npm install bcrypt fails at node-gyp rebuild
body: <p>i am trying to install the node module <code>bcrypt</code></p>
  
  <p>so i ran the following command</p>
  
  <pre><code>sudo npm install bcrypt
  </code></pre>
  
  <p>With this i get the following error:</p>
  
  <pre><code>gyp ERR! build error 
  gyp ERR! stack Error: `make` failed with exit code: 2
  gyp ERR! stack     at ChildProcess.onExit (/usr/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:270:23)
  gyp ERR! stack     at emitTwo (events.js:87:13)
  gyp ERR! stack     at ChildProcess.emit (events.js:172:7)
  gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:200:12)
  gyp ERR! System Linux 3.19.0-25-generic
  gyp ERR! command "/usr/bin/nodejs" "/usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
  gyp ERR! cwd /var/www/learningbankapi/src/node_modules/bcrypt
  gyp ERR! node -v v4.2.2
  gyp ERR! node-gyp -v v3.0.3
  gyp ERR! not ok 
  npm ERR! Linux 3.19.0-25-generic
  npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install" "bcrypt"
  npm ERR! node v4.2.2
  npm ERR! npm  v2.14.7
  npm ERR! code ELIFECYCLE
  
  npm ERR! bcrypt@0.8.1 install: `node-gyp rebuild`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the bcrypt@0.8.1 install script 'node-gyp rebuild'.
  npm ERR! This is most likely a problem with the bcrypt 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 their info via:
  npm ERR!     npm owner ls bcrypt
  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 attempted to remove all modules and <code>sudo npm install</code> ive also tried to rebuild but with no result can anyone help me out ?</p>