a.rb

root@Debian-70-wheezy-64-minimal:/home/epinux/dev/notebook# npm install phosphor-dragdrop

> phosphor-dragdrop@0.9.1 postinstall /home/epinux/dev/notebook/node_modules/phosphor-dragdrop
> npm dedupe

npm ERR! Linux 3.16.0-4-amd64
npm ERR! argv "/usr/bin/nodejs" "/usr/local/bin/npm" "dedupe"
npm ERR! node v4.4.3
npm ERR! npm  v3.7.5
npm ERR! path /root/.npm/_locks
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall mkdir

npm ERR! Error: EACCES: permission denied, mkdir '/root/.npm/_locks'
npm ERR!     at Error (native)
npm ERR!  { [Error: EACCES: permission denied, mkdir '/root/.npm/_locks']
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   syscall: 'mkdir',
npm ERR!   path: '/root/.npm/_locks' }
npm ERR! 
npm ERR! Please try running this command again as root/Administrator.

npm ERR! Please include the following file with any support request:
npm ERR!     /home/epinux/dev/notebook/node_modules/phosphor-dragdrop/npm-debug.log
npm WARN optional Skipping failed optional dependency /chokidar/fsevents:
npm WARN notsup Not compatible with your operating system or architecture: fsevents@1.0.11
npm ERR! Linux 3.16.0-4-amd64
npm ERR! argv "/usr/bin/nodejs" "/usr/local/bin/npm" "install" "phosphor-dragdrop"
npm ERR! node v4.4.3
npm ERR! npm  v3.7.5
npm ERR! code ELIFECYCLE

npm ERR! phosphor-dragdrop@0.9.1 postinstall: `npm dedupe`
npm ERR! Exit status 243
npm ERR! 
npm ERR! Failed at the phosphor-dragdrop@0.9.1 postinstall script 'npm dedupe'.
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 phosphor-dragdrop package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     npm dedupe
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs phosphor-dragdrop
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls phosphor-dragdrop
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /home/epinux/dev/notebook/npm-debug.log
root@Debian-70-wheezy-64-minimal:/home/epinux/dev/notebook#