Index: source/ps/KeyName.h
===================================================================
--- source/ps/KeyName.h	(revision 8832)
+++ source/ps/KeyName.h	(revision 8833)
@@ -34,8 +34,13 @@
 	MOUSE_MIDDLE = SDLK_LAST + SDL_BUTTON_MIDDLE,
 	MOUSE_WHEELUP = SDLK_LAST + SDL_BUTTON_WHEELUP,
 	MOUSE_WHEELDOWN = SDLK_LAST + SDL_BUTTON_WHEELDOWN,
+#if SDL_VERSION_ATLEAST(1, 2, 13)
 	MOUSE_X1 = SDLK_LAST + SDL_BUTTON_X1,
 	MOUSE_X2 = SDLK_LAST + SDL_BUTTON_X2,
+#else
+	MOUSE_X1 = SDLK_LAST + SDL_BUTTON_WHEELDOWN + 1,
+	MOUSE_X2 = SDLK_LAST + SDL_BUTTON_WHEELDOWN + 2,
+#endif
 
 	// 'Keycodes' for the unified modifier keys
 	UNIFIED_SHIFT,
Index: source/ps/Hotkey.cpp
===================================================================
--- source/ps/Hotkey.cpp	(revision 8832)
+++ source/ps/Hotkey.cpp	(revision 8833)
@@ -178,7 +178,11 @@
 		break;
 	case SDL_MOUSEBUTTONDOWN:
 	case SDL_MOUSEBUTTONUP:
+#if SDL_VERSION_ATLEAST(1, 2, 13)
 		if ((int)ev->ev.button.button <= SDL_BUTTON_X2)
+#else
+		if ((int)ev->ev.button.button <= SDL_BUTTON_WHEELDOWN)
+#endif
 		{
 			keycode = SDLK_LAST + (int)ev->ev.button.button;
 			break;