title: How to resolve an NPM install error?
body: <p>I'm having issues moving my site from Cloud9 to DigitalOcean.</p>
  
  <p>Most components seem to have installed (though ase-tools and node-gd can't be found), but a few things aren't working, and I get these errors when installing.</p>
  
  <pre><code>root@lospec:~/lospec# npm install
  npm WARN deprecated minimatch@1.0.0: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
  npm WARN deprecated minimatch@2.0.10: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
  npm WARN prefer global node-gyp@3.3.1 should be installed with -g
  
  &gt; node-gd@1.4.0 install /root/lospec/node_modules/node-gd
  &gt; node-gyp rebuild
  
  ./util.sh: 1: ./util.sh: pkg-config: not found
  gyp: Call to './util.sh png16' returned exit status 0 while in 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 (/usr/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:305:16)
  gyp ERR! stack     at emitTwo (events.js:106:13)
  gyp ERR! stack     at ChildProcess.emit (events.js:191:7)
  gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:215:12)
  gyp ERR! System Linux 4.4.0-63-generic
  gyp ERR! command "/usr/bin/nodejs" "/usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
  gyp ERR! cwd /root/lospec/node_modules/node-gd
  gyp ERR! node -v v6.10.0
  gyp ERR! node-gyp -v v3.4.0
  gyp ERR! not ok
  npm ERR! Linux 4.4.0-63-generic
  npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install"
  npm ERR! node v6.10.0
  npm ERR! npm  v3.10.10
  npm ERR! code ELIFECYCLE
  
  npm ERR! node-gd@1.4.0 install: `node-gyp rebuild`
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the node-gd@1.4.0 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 node-gd 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 node-gd
  npm ERR! Or if that isn't available, you can get their info via:
  npm ERR!     npm owner ls node-gd
  npm ERR! There is likely additional logging output above.
  
  npm ERR! Please include the following file with any support request:
  npm ERR!     /root/lospec/npm-debug.log
  </code></pre>
  
  <p>I can't tell what's really causing the error. I think node-gd, node-gyp, pkg-config? </p>
  
  <p>Here's my package.json: <a href="http://pastebin.com/raw/saykdjT2" rel="nofollow noreferrer">http://pastebin.com/raw/saykdjT2</a></p>