diff -rupN --no-dereference gtk+-2.24.33/gtk/gtkstatusicon.c gtk+-2.24.33-new/gtk/gtkstatusicon.c
--- gtk+-2.24.33/gtk/gtkstatusicon.c	2021-01-05 15:57:58.164719400 +0100
+++ gtk+-2.24.33-new/gtk/gtkstatusicon.c	2021-01-05 15:57:58.675715090 +0100
@@ -764,11 +764,13 @@ wndproc (HWND   hwnd,
 	  button = 3;
 	  goto buttondown0;
 
+#ifdef WM_XBUTTONDOWN
 	case WM_XBUTTONDOWN:
 	  if (HIWORD (wparam) == XBUTTON1)
 	    button = 4;
 	  else
 	    button = 5;
+#endif
 
 	buttondown0:
 	  bc = g_new (ButtonCallbackData, 1);
@@ -790,11 +792,13 @@ wndproc (HWND   hwnd,
 	  button = 3;
 	  goto buttonup0;
 
+#ifdef WM_XBUTTONUP
 	case WM_XBUTTONUP:
 	  if (HIWORD (wparam) == XBUTTON1)
 	    button = 4;
 	  else
 	    button = 5;
+#endif
 
 	buttonup0:
 	  bc = g_new (ButtonCallbackData, 1);