Syntax error on running gulpfile.js

[kriskeillor]

I'm getting the following error trying to build the demo site after cloning the repo and running npm install:

$ ./gulpfile.js
./gulpfile.js: line 1: syntax error near unexpected token `('
./gulpfile.js: line 1: `var gulp        = require('gulp'),'

Can't build. I'm on Win 8.1.
This seems to be a somewhat common .js issue, but I'm new to gulp.

Shame because your live demo looks super cool, would love to fork this project.