title: bcrypt not installing with npm (Mac OS X 10.9 - Node v0.10.22)
body: <p>System specs:
  Mac OS X 10.9
  Node v0.10.22</p>
  
  <p>I get the following error when trying to install bcrypt. Any advice on how to fix this issue?</p>
  
  <p>Any help would be greatly appreciated.</p>
  
  <pre><code>&gt; bcrypt@0.7.6 install /Users/eDawg/Desktop/eggstage/node_modules/bcrypt
  &gt; node-gyp rebuild
  
    CXX(target) Release/obj.target/bcrypt_lib/src/blowfish.o
  ../src/blowfish.cc:47:10: fatal error: 'sys/types.h' file not found
  #include &lt;sys/types.h&gt;
           ^
  1 error generated.
  make: *** [Release/obj.target/bcrypt_lib/src/blowfish.o] Error 1
  gyp ERR! build error 
  gyp ERR! stack Error: `make` failed with exit code: 2
  gyp ERR! stack     at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:267:23)
  gyp ERR! stack     at ChildProcess.EventEmitter.emit (events.js:98:17)
  gyp ERR! stack     at Process.ChildProcess._handle.onexit (child_process.js:789:12)
  gyp ERR! System Darwin 13.0.0
  gyp ERR! command "node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
  gyp ERR! cwd /Users/eDawg/Desktop/eggstage/node_modules/bcrypt
  gyp ERR! node -v v0.10.22
  gyp ERR! node-gyp -v v0.11.0
  gyp ERR! not ok 
  npm ERR! bcrypt@0.7.6 install: `node-gyp rebuild`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the bcrypt@0.7.6 install script.
  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! System Darwin 13.0.0
  npm ERR! command "node" "/usr/local/bin/npm" "install" "bcrypt"
  npm ERR! cwd /Users/eDawg/Desktop/eggstage
  npm ERR! node -v v0.10.22
  npm ERR! npm -v 1.3.14
  npm ERR! code ELIFECYCLE
  npm ERR! 
  npm ERR! Additional logging details can be found in:
  npm ERR!     /Users/eDawg/Desktop/eggstage/npm-debug.log
  npm ERR! not ok code 0
  </code></pre>