Ok, so it's very simple:
- add include path with -Iyour/path/to/sfml/include
- add library path with -Lyour/path/to/sfml/lib
- link the SFML libraries with -lsfml-graphics -lsfml-window -lsfml-system (same for sfml-audio and sfml-network if you use them).
- if you link SFML statically, define SFML_STATIC with -DSFML_STATIC
This will basically be the same for any other library.