Patched to compile on Windows.
diff --git a/src/video/windows/SDL_windowsmouse.c b/src/video/windows/SDL_windowsmouse.c
index 50a9dac..1998502 100644
--- a/src/video/windows/SDL_windowsmouse.c
+++ b/src/video/windows/SDL_windowsmouse.c
@@ -282,8 +282,8 @@ WIN_GetGlobalMouseState(int *x, int *y)
retval |= GetAsyncKeyState(VK_LBUTTON) & 0x8000 ? SDL_BUTTON_LMASK : 0;
retval |= GetAsyncKeyState(VK_RBUTTON) & 0x8000 ? SDL_BUTTON_RMASK : 0;
retval |= GetAsyncKeyState(VK_MBUTTON) & 0x8000 ? SDL_BUTTON_MMASK : 0;
- retval |= GetAsyncKeyState(VK_X1BUTTON) & 0x8000 ? SDL_BUTTON_X1MASK : 0;
- retval |= GetAsyncKeyState(VK_X2BUTTON) & 0x8000 ? SDL_BUTTON_X2MASK : 0;
+ retval |= GetAsyncKeyState(VK_XBUTTON1) & 0x8000 ? SDL_BUTTON_X1MASK : 0;
+ retval |= GetAsyncKeyState(VK_XBUTTON2) & 0x8000 ? SDL_BUTTON_X2MASK : 0;
return retval;
}