gistfile1.rb

class App < Sinatra::Base
  
  register Sinatra::AssetPack

  assets {
    serve '/js',     :from => 'app/js'        # Optional
    serve '/css',    :from => 'app/css'       # Optional
    serve '/img', :from => 'app/img'    # Optional

    # The second parameter defines where the compressed version will be served.
    # (Note: that parameter is optional, AssetPack will figure it out.)
    
    js :lib, '/js/lib.js', [
      '/js/vendor/jquery.js',
      '/js/vendor/underscore.js'
    ]
    js :script, '/js/script.js', [
     '/js/app/*.js', 
    ]
    js :modernizr, '/js/modernizr.js', [
      '/js/vendor/special/modernizr.js',
    ]
    css :style, '/css/style.css', [
      '/css/normalize.css',
      '/css/*.css'
    ]

    js_compression  :jsmin      # Optional
    css_compression :sass       # Optional
  }

end  

run App