slide.cpp:2:21: windows.h: No such file or directory slide.cpp: In function `int main()': slide.cpp:37: `VK_UP' undeclared (first use this function) slide.cpp:37: (Each undeclared identifier is reported only once for each function it appears in.) slide.cpp:37: `GetAsyncKeyState' undeclared (first use this function) slide.cpp:55: `VK_DOWN' undeclared (first use this function) slide.cpp:75: `VK_RIGHT' undeclared (first use this function) slide.cpp:93: `VK_LEFT' undeclared (first use this function) slide.cpp:116: `Sleep' undeclared (first use this function) slide.cpp:123: `EXT_SUCCES' undeclared (first use this function)