Cannot install on Mac OS X

Mac OS X, v10.11.5
Node v4.4.3
NPM v3.10.2

```
npm install devtool -g
/usr/local/bin/devtool -> /usr/local/lib/node_modules/devtool/bin/index.js

> fsevents@1.0.12 install /usr/local/lib/node_modules/devtool/node_modules/fsevents
> node-pre-gyp install --fallback-to-build

[fsevents] Success: "/usr/local/lib/node_modules/devtool/node_modules/fsevents/lib/binding/Release/node-v46-darwin-x64/fse.node" is installed via remote

> electron-prebuilt@1.1.1 postinstall /usr/local/lib/node_modules/devtool/node_modules/electron-prebuilt
> node install.js

Downloading electron-v1.1.1-darwin-x64.zip
[============================================>] 100.0% of 41.73 MB (366.08 kB/s)
/usr/local/lib/node_modules/devtool/node_modules/electron-prebuilt/install.js:22
throw err
^

Error: EACCES: permission denied, rename '/usr/local/lib/node_modules/devtool/node_modules/electron-prebuilt/electron-tmp-download-16977-1467642782907/electron-v1.1.1-darwin-x64.zip' -> '/Users/oy/.electron/electron-v1.1.1-darwin-x64.zip'
at Error (native)
/usr/local/lib
`-- (empty)

npm ERR! Darwin 15.5.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "devtool" "-g"
npm ERR! node v4.4.3
npm ERR! npm v3.10.2
npm ERR! code ELIFECYCLE

npm ERR! electron-prebuilt@1.1.1 postinstall: `node install.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the electron-prebuilt@1.1.1 postinstall script 'node install.js'.
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 electron-prebuilt package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node install.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs electron-prebuilt
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls electron-prebuilt
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! /Users/oy/npm-debug.log
npm ERR! code 1
```