Hi,

I am quite new to Gosu and I have an application that is running perfectly under Os X. I have tried to run it on a Raspberry Pi under Raspbian Jessie. I Installed everything as stated in the getting started guide (all dependencies, SDL and SDL_ttf compiled) and had no problem installing the gosu gem.
The application starts and opens the window but nothing is drawn.

Just to be sure I executed a basic "hello world" but I got the same result. Runs fine, nothing is shown in the screen (neither windowed nor fullscreen).

=====CODE=====
require 'rubygems'
require 'gosu'

class Hello < Gosu::Window
  def initialize
    super 640, 480, true
    self.caption = 'Hello World!'
    @background_image = Gosu::Image.new("media/background.png", :tileable => true)   
  end

  def draw
    @background_image.draw(0, 0, 0)
    puts 'drawing'
  end
end

window = Hello.new
window.show
=====CODE=====

I get "drawing" written in the terminal, so 'draw' is called and executed, but nothing shown on the screen.

Any Idea? Am i missing something? Some library needed and not installed? Some settings I overlooked?

Thanks in advance,
dsm0nd