title: NodeJS npm install throws error
body: <p>I am new to NodeJS and I am trying to install node saas by <code>sudo npm install -g --unsafe-perms node-sass</code>
  and I see this</p>
  
  <pre><code>/usr/local/bin/node-sass -&gt; /usr/local/lib/node_modules/node-sass/bin/node-sass
  
  &gt; node-sass@4.7.2 install /usr/local/lib/node_modules/node-sass
  &gt; node scripts/install.js
  
  Unable to save binary /usr/local/lib/node_modules/node-sass/vendor/linux-x64-59 : { Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/node-sass/vendor'
      at Object.fs.mkdirSync (fs.js:905:18)
      at sync (/usr/local/lib/node_modules/node-sass/node_modules/mkdirp/index.js:71:13)
      at Function.sync (/usr/local/lib/node_modules/node-sass/node_modules/mkdirp/index.js:77:24)
      at checkAndDownloadBinary (/usr/local/lib/node_modules/node-sass/scripts/install.js:111:11)
      at Object.&lt;anonymous&gt; (/usr/local/lib/node_modules/node-sass/scripts/install.js:154:1)
      at Module._compile (module.js:660:30)
      at Object.Module._extensions..js (module.js:671:10)
      at Module.load (module.js:573:32)
      at tryModuleLoad (module.js:513:12)
      at Function.Module._load (module.js:505:3)
    errno: -13,
    code: 'EACCES',
    syscall: 'mkdir',
    path: '/usr/local/lib/node_modules/node-sass/vendor' }
  
  &gt; node-sass@4.7.2 postinstall /usr/local/lib/node_modules/node-sass
  &gt; node scripts/build.js
  
  Building: /usr/local/bin/node /usr/local/lib/node_modules/node-sass/node_modules/node-gyp/bin/node-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libsass_library=
  gyp info it worked if it ends with ok
  gyp verb cli [ '/usr/local/bin/node',
  gyp verb cli   '/usr/local/lib/node_modules/node-sass/node_modules/node-gyp/bin/node-gyp.js',
  gyp verb cli   'rebuild',
  gyp verb cli   '--verbose',
  gyp verb cli   '--libsass_ext=',
  gyp verb cli   '--libsass_cflags=',
  gyp verb cli   '--libsass_ldflags=',
  gyp verb cli   '--libsass_library=' ]
  gyp info using node-gyp@3.6.2
  gyp info using node@9.4.0 | linux | x64
  gyp verb command rebuild []
  gyp verb command clean []
  gyp verb clean removing "build" directory
  gyp verb command configure []
  gyp verb check python checking for Python executable "python2" in the PATH
  gyp verb `which` succeeded python2 /usr/bin/python2
  gyp verb check python version `/usr/bin/python2 -c "import platform; print(platform.python_version());"` returned: "2.7.12\n"
  gyp verb get node dir no --target version specified, falling back to host node version: 9.4.0
  gyp verb command install [ '9.4.0' ]
  gyp verb install input version string "9.4.0"
  gyp verb install installing version: 9.4.0
  gyp verb install --ensure was passed, so won't reinstall if already installed
  gyp verb install version is already installed, need to check "installVersion"
  gyp verb got "installVersion" 9
  gyp verb needs "installVersion" 9
  gyp verb install version is good
  gyp verb get node dir target node version installed: 9.4.0
  gyp verb build dir attempting to create "build" dir: /usr/local/lib/node_modules/node-sass/build
  gyp ERR! configure error 
  gyp ERR! stack Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/node-sass/build'
  gyp ERR! System Linux 4.13.0-32-generic
  gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/node-sass/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
  gyp ERR! cwd /usr/local/lib/node_modules/node-sass
  gyp ERR! node -v v9.4.0
  gyp ERR! node-gyp -v v3.6.2
  gyp ERR! not ok 
  Build failed with error code: 1
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! node-sass@4.7.2 postinstall: `node scripts/build.js`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the node-sass@4.7.2 postinstall script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     /home/baig772/.npm/_logs/2018-02-14T18_01_56_774Z-debug.log
  </code></pre>