Two mistakes:
- you have duplicated SFML libraries in your linker options: "other linker option -lsfml-xxx" is the same as "link library sfml-xxx"
- you're using old 2.0 or 1.6 headers, the Window::Display() and Window::IsOpened() functions don't exist anymore in the latest SFML 2 revisions.
Why is SFML 2 such a hurdle?
Why are people making stupid mistakes so angry?
