Sass task for running libsass

sass.js

var gulp = require('gulp');
var sass = require('node-sass');
var handleErrors = require('../util/handleErrors');
var config = require('../config').sass;
var mkdirp = require('mkdirp')
var fs = require('fs')
var getDirName = require('path').dirname

var writeFile = function(path, contents){
  mkdirp(getDirName(path), function(err){
    if (err) handleErrors(err);

    fs.writeFile(path, contents);
  });
};

gulp.task('sass', ['images'], function () {
  return sass.render({
    file: config.src,
    imagePath: config.imagePath,
    outputStyle: 'compressed',
    error: function(error){
      handleErrors(error);
    },
    success: function(css){
      return writeFile(config.dest + config.fileName, css);
    }
  });
});

Did you try gulp-sass? It uses libsass under the hood. Task setup is pretty straightforward. I can send it to you if you want.