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node-sass でOS X 64-bit with Unsupported runtimeと言われた時の対策

下記のようなエラーが出た

$ node-sass
/usr/local/lib/node_modules/node-sass/lib/binding.js:13
      throw new Error(errors.unsupportedEnvironment());
      ^

Error: Node Sass does not yet support your current environment: OS X 64-bit with Unsupported runtime (64)
For more information on which environments are supported please see:
https://github.com/sass/node-sass/releases/tag/v4.5.0
    at module.exports (/usr/local/lib/node_modules/node-sass/lib/binding.js:13:13)
    at Object.<anonymous> (/usr/local/lib/node_modules/node-sass/lib/index.js:14:35)
    at Module._compile (internal/modules/cjs/loader.js:678:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:689:10)
    at Module.load (internal/modules/cjs/loader.js:589:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:528:12)
    at Function.Module._load (internal/modules/cjs/loader.js:520:3)
    at Module.require (internal/modules/cjs/loader.js:626:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object.<anonymous> (/usr/local/lib/node_modules/node-sass/bin/node-sass:11:10)

一度アンインストールしてから

npm uninstall -g node-sass

再度インストールしたら行けた

npm install -g node-sass