I used the example in the tutorial:
1>------ Build started: Project: sfml4, Configuration: Debug Win32 ------
1> main.cpp
1>main.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall sf::RenderWindow::~RenderWindow(void)" (??1RenderWindow@sf@@UAE@XZ) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall sf::Window::display(void)" (?display@Window@sf@@QAEXXZ) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall sf::RenderTarget::draw(class sf::Drawable const &,class sf::RenderStates const &)" (?draw@RenderTarget@sf@@QAEXABVDrawable@2@ABVRenderStates@2@@Z) referenced in function _main
1>main.obj : error LNK2001: unresolved external symbol "public: static class sf::RenderStates const sf::RenderStates::Default" (?Default@RenderStates@sf@@2V12@B)
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall sf::RenderTarget::clear(class sf::Color const &)" (?clear@RenderTarget@sf@@QAEXABVColor@2@@Z) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: __thiscall sf::Color::Color(unsigned char,unsigned char,unsigned char,unsigned char)" (??0Color@sf@@QAE@EEEE@Z) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall sf::Window::close(void)" (?close@Window@sf@@QAEXXZ) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: bool __thiscall sf::Window::pollEvent(class sf::Event &)" (?pollEvent@Window@sf@@QAE_NAAVEvent@2@@Z) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: bool __thiscall sf::Window::isOpen(void)const " (?isOpen@Window@sf@@QBE_NXZ) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall sf::Shape::setFillColor(class sf::Color const &)" (?setFillColor@Shape@sf@@QAEXABVColor@2@@Z) referenced in function _main
1>main.obj : error LNK2001: unresolved external symbol "public: static class sf::Color const sf::Color::Green" (?Green@Color@sf@@2V12@B)
1>main.obj : error LNK2019: unresolved external symbol "public: __thiscall sf::CircleShape::CircleShape(float,unsigned int)" (??0CircleShape@sf@@QAE@MI@Z) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: __thiscall sf::RenderWindow::RenderWindow(class sf::VideoMode,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,unsigned int,struct sf::ContextSettings const &)" (??0RenderWindow@sf@@QAE@VVideoMode@1@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@IABUContextSettings@1@@Z) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: __thiscall sf::VideoMode::VideoMode(unsigned int,unsigned int,unsigned int)" (??0VideoMode@sf@@QAE@III@Z) referenced in function _main
1>main.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall sf::Shape::~Shape(void)" (??1Shape@sf@@UAE@XZ) referenced in function "public: virtual __thiscall sf::CircleShape::~CircleShape(void)" (??1CircleShape@sf@@UAE@XZ)
1>c:\documents and settings\pa mama\my documents\visual studio 2010\Projects\sfml4\Debug\sfml4.exe : fatal error LNK1120: 15 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========