если ещё надо
расширения правильные. подключать как-то так:
LIBS += -L”/home/user/Projects/SFML/lib”
CONFIG(release, debug|release): LIBS += -lsfml-audio -lsfml-graphics -lsfml-network -lsfml-window -lsfml-system
CONFIG(debug, debug|release): LIBS += -lsfml-audio-d -lsfml-graphics-d -lsfml-network-d -lsfml-window-d -lsfml-system-d
INCLUDEPATH += “/home/user/Projects/SFML/include”
DEPENDPATH += “/home/user/Projects/SFML/include”