title: NodeJS OSX error building node-sass
body: <p>I am running OSX 10.11.1 and trying to <code>npm install</code> a project that contains a node-sass dependency in the package.json:</p>
  
  <p>"dependencies": {
      "node-sass": "^3.4.2"
    }</p>
  
  <p>I am running NPM version 2.14.7 and node version 4.2.3.  When I run <code>npm install</code> or npm <code>rebuild node-sass</code> I get the following error output:</p>
  
  <pre>
  > node-sass@2.1.1 postinstall /Users/markroper/code/mktg/node_modules/gulp-sass/node_modules/node-sass
  > node scripts/build.js
  gyp: /Users/markroper/.node-gyp/4.2.3/common.gypi not found (cwd: /Users/markroper/code/mktg/node_modules/gulp-sass/node_modules/node-sass) while reading includes of binding.gyp while trying to load binding.gyp
  gyp ERR! configure error 
  gyp ERR! stack Error: `gyp` failed with exit code: 1
  gyp ERR! stack     at ChildProcess.onCpExit (/Users/markroper/code/mktg/node_modules/gulp-sass/node_modules/node-sass/node_modules/pangyp/lib/configure.js:346:16)
  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 Darwin 15.0.0
  gyp ERR! command "/usr/local/bin/node" "/Users/markroper/code/mktg/node_modules/gulp-sass/node_modules/node-sass/node_modules/pangyp/bin/node-gyp" "rebuild"
  gyp ERR! cwd /Users/markroper/code/mktg/node_modules/gulp-sass/node_modules/node-sass
  gyp ERR! node -v v4.2.3
  gyp ERR! pangyp -v v2.3.3
  gyp ERR! not ok 
  Build failed
  </pre>
  
  <p>Has anyone worked around this error with these versions?</p>