title: Node-Sass 4.9 modules installing issue on Node 10.2
body: <p>I get an issue when installing <code>node-sass</code> on my server (Ubuntu 16.04). On my local server I haven't theses errors...</p>
  
  <p>NodeJS version : v10.2.1</p>
  
  <p>Npm version : 5.6.0</p>
  
  <p>Node sass version : ^4.9.0</p>
  
  <p><strong>Error message :</strong></p>
  
  <pre><code>****@web-test:/var/www/****$ sudo npm i node-sass
  
  &gt; node-sass@4.9.0 install /var/www/****/node_modules/node-sass
  &gt; node scripts/install.js
  
  Unable to save binary /var/www/****/node_modules/node-sass/vendor/linux-x64-64 : { Error: EACCES: permission denied, mkdir '/var/www/****/node_modules/node-sass/vendor'
      at Object.fs.mkdirSync (fs.js:872:3)
      at sync (/var/www/****/node_modules/mkdirp/index.js:71:13)
      at Function.sync (/var/www/****/node_modules/mkdirp/index.js:77:24)
      at checkAndDownloadBinary (/var/www/****/node_modules/node-sass/scripts/install.js:114:11)
      at Object.&lt;anonymous&gt; (/var/www/****/node_modules/node-sass/scripts/install.js:157:1)
      at Module._compile (internal/modules/cjs/loader.js:702:30)
      at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
      at Module.load (internal/modules/cjs/loader.js:612:32)
      at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
      at Function.Module._load (internal/modules/cjs/loader.js:543:3)
    errno: -13,
    syscall: 'mkdir',
    code: 'EACCES',
    path: '/var/www/****/node_modules/node-sass/vendor' }
  gyp ERR! configure error
  gyp ERR! stack Error: EACCES: permission denied, mkdir '/var/www/****/node_modules/node-sass/build'
  gyp ERR! System Linux 4.4.0-116-generic
  gyp ERR! command "/usr/local/bin/node" "/var/www/****/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
  gyp ERR! cwd /var/www/****/node_modules/node-sass
  gyp ERR! node -v v10.2.1
  gyp ERR! node-gyp -v v3.6.2
  gyp ERR! not ok
  Build failed with error code: 1
  npm WARN ****@1.0.0 No repository field.
  
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! node-sass@4.9.0 postinstall: `node scripts/build.js`
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the node-sass@4.9.0 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/****/.npm/_logs/2018-06-04T14_54_18_635Z-debug.log
  </code></pre>
  
  <p><strong>Permissions on the folder :</strong> <code>drwxr-xr-x 11 root     root         4096 june   4 17:25 ****</code></p>
  
  <p><strong>Error after updating rights :</strong></p>
  
  <pre><code>gyp ERR! build error
  gyp ERR! stack Error: `make` failed with exit code: 2
  gyp ERR! stack     at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:258:23)
  gyp ERR! stackbcrypt_lib.target.mk:97: recipe for target 'Release/obj.target/bcrypt_lib/src/bcrypt_node.o' failed
  make: *** [Release/obj.target/bcrypt_lib/src/bcrypt_node.o] Error 1
  make: Leaving directory '/var/www/****/node_modules/bcrypt/build'
  gyp ERR! build error
  gyp ERR! stack Error: `make` failed with exit code: 2
  gyp ERR! stack     at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:258:23)
  gyp ERR! stack     at ChildProcess.emit (events.js:182:13)
  gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:237:12)
  gyp ERR! System Linux 4.4.0-116-generic
  gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "build" "--fallback-to-build" "--module=/var/www/****/node_modules/bcrypt/lib/binding/bcrypt_lib.node" "--module_name=bcrypt_lib" "--module_path=/var/www/****/node_modules/bcrypt/lib/binding"
  gyp ERR! cwd /var/www/****/node_modules/bcrypt
  gyp ERR! node -v v10.2.1
  gyp ERR! node-gyp -v v3.6.2
  gyp ERR! not ok
       at ChildProcess.emit (events.js:182:13)
  gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:237:12)
  gyp ERR! System Linux 4.4.0-116-generic
  gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "build" "--fallback-to-build" "--module=/var/www/****/node_modules/bcrypt/lib/binding/bcrypt_lib.node" "--module_name=bcrypt_lib" "--module_path=/var/www/****/node_modules/bcrypt/lib/binding"
  gyp ERR! cwd /var/www/****/node_modules/bcrypt
  gyp ERR! node -v v10.2.1
  gyp ERR! node-gyp -v v3.6.2
  gyp ERR! not ok
  node-pre-gyp ERR! build error
  node-pre-gyp ERR! stack Error: Failed to execute '/usr/local/bin/node /usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js build --fallback-to-build --module=/var/www/****/node_modules/bcrypt/lib/binding/bcrypt_lib.node --module_name=bcrypt_lib --module_path=/var/www/****/node_modules/bcrypt/lib/binding' (1)
  node-pre-gyp ERR! stack     at ChildProcess.&lt;anonymous&gt; (/var/www/****/node_modules/node-pre-gyp/lib/util/compile.js:83:29)
  node-pre-gyp ERR! stack     at ChildProcess.emit (events.js:182:13)
  node-pre-gyp ERR! stack     at maybeClose (internal/child_process.js:961:16)
  node-pre-gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:248:5)
  node-pre-gyp ERR! System Linux 4.4.0-116-generic
  node-pre-gyp ERR! command "/usr/local/bin/node" "/var/www/****/node_modules/.bin/node-pre-gyp" "install" "--fallback-to-build" node-pre-gyp ERR! cwd /var/www/****/node_modules/bcrypt
  node-pre-gyp ERR! node -v v10.2.1
  node-pre-gyp ERR! node-pre-gyp -v v0.6.36
  node-pre-gyp ERR! not ok
  Failed to execute '/usr/local/bin/node /usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js build --fallback-to-build --module=/var/www/****/node_modules/bcrypt/lib/binding/bcrypt_lib.node --module_name=bcrypt_lib --module_path=/var/www/****/node_modules/bcrypt/lib/binding' (1)
  npm WARN ****@1.0.0 No repository field.
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.4 (node_modules/fsevents):
  npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.4: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
  
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! bcrypt@1.0.3 install: `node-pre-gyp install --fallback-to-build`
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the bcrypt@1.0.3 install script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  </code></pre>
  
  <p><strong>Right solution (after many searches) :</strong></p>
  
  <pre><code>sudo rm -rf ~/.node-gyp
  sudo npm cache clean -f
  sudo npm install -g n
  sudo n stable
  sudo npm i --unsafe-perm
  </code></pre>