nodejs + gulp - TypeError: require(...) is not a function?

I have the latest versions of node and npm installed:

$ node -v
v7.10.0

$ npm -v
4.2.0

And gulp:

$ sudo npm install gulp -g

But when I try to check its version:

$ gulp -v
/usr/local/lib/node_modules/gulp/bin/gulp.js:14
var argv = require('minimist')(process.argv.slice(2));
                              ^

TypeError: require(...) is not a function
    at Object.<anonymous> (/usr/local/lib/node_modules/gulp/bin/gulp.js:14:31)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.runMain (module.js:605:10)
    at run (bootstrap_node.js:427:7)
    at startup (bootstrap_node.js:151:9)
    at bootstrap_node.js:542:3

Why? Any ideas?

via teelou