gulpfile.js

// Include require nodejs modules
var gulp = require('gulp');
var gutil = require('gulp-util');
var concat = require('gulp-concat');
var less = require('gulp-less');
var compressor = require('gulp-compressor');

// Define paths
var paths = {
  lessFile: 'includes/css/styles.less',
  lessFiles: 'includes/css/*.less',
  cssDir: 'includes/css',
  cssFiles: 'includes/css/*.css',
  minDir: 'includes/min'
};

gulp.task('css', ['less'], function() {
  // Minify and copy all CSS
  return gulp.src(paths.cssFiles)
    .pipe(compressor())
    .pipe(concat('styles.min.css'))
    .on('error', gutil.log)
    .pipe(gulp.dest(paths.minDir));
});

gulp.task('less', function () {
  // Compile less into CSS
  return gulp.src(paths.lessFile)
    .pipe(less())
    .on('error', gutil.log)
    .pipe(gulp.dest(paths.cssDir));
});

// Rerun the task when a file changes
gulp.task('watch', function() {
  gulp.watch(paths.lessFiles, ['css']);
});

// The default task (called when you run `gulp` from cli)
gulp.task('default', ['css']);

You can take out 'less' on line #36 -- 'css' runs and has a dependency of 'less'. Same for #line 40.

Thanks Todd so it does. Updated as suggested.