npm ERR! Failed at the node-sass@3.13.1 postinstall script 'node scripts/build.js'.

Deal with npm is a big headache.
I have npm 3.53 and node 8.0.0-pre
Today I has been fighting with run npm install and I had this error:

npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.0.0 (node_modules/chokidar/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.1: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm WARN You are using a pre-release version of node and things may not work as expected
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: iltorb@1.0.13 (node_modules/iltorb):
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: iltorb@1.0.13 install: `node-gyp rebuild`
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: Exit status 1
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! node-sass@3.13.1 postinstall: `node scripts/build.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the node-sass@3.13.1 postinstall script 'node scripts/build.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 node-sass package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node scripts/build.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs node-sass
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls node-sass
npm ERR! There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/nboettcher/.npm/_logs/2017-03-21T17_22_55_979Z-debug.log

To avoid it just use global mode:

sudo npm install -g npm@3.5.3

Enjoy it!