diff --git a/stepmania/src/Makefile.am b/stepmania/src/Makefile.am
index 9b6efb9c82..e80b01d623 100644
--- a/stepmania/src/Makefile.am
+++ b/stepmania/src/Makefile.am
@@ -149,6 +149,12 @@ Dialog = arch/Dialog/Dialog.cpp arch/Dialog/Dialog.h arch/Dialog/DialogDriver.h
 
 Threads = arch/Threads/Threads.h
 
+if HAVE_X11
+InputHandler += arch/InputHandler/InputHandler_X11.cpp arch/InputHandler/InputHandler_X11.h
+LowLevelWindow += arch/LowLevelWindow/LowLevelWindow_X11.cpp arch/LowLevelWindow/LowLevelWindow_X11.h
+ArchUtils += archutils/Unix/X11Helper.cpp archutils/Unix/X11Helper.h
+endif
+
 if HAVE_SDL
 InputHandler += arch/InputHandler/InputHandler_SDL.cpp arch/InputHandler/InputHandler_SDL.h
 LowLevelWindow += arch/LowLevelWindow/LowLevelWindow_SDL.cpp arch/LowLevelWindow/LowLevelWindow_SDL.h