gulker is a mediocre starting build for building Jekyll with Gulp.js.
You're going to need node modules. You may install them with this nifty command:
npm install browser-sync gulp-rename gulp-notify gulp-ruby-sass gulp-minify-css gulp-postcss autoprefixer-core gulp-jshint gulp-concat gulp-uglify
For gulp-jshint, gekulp prefers jshint-stylish. It's pretty.