diff --git a/contrib/src/gizmos/dynamicsash.cpp b/contrib/src/gizmos/dynamicsash.cpp
index 98bc41207e..9317b5f4f0 100644
--- a/contrib/src/gizmos/dynamicsash.cpp
+++ b/contrib/src/gizmos/dynamicsash.cpp
@@ -10,6 +10,23 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
+#ifdef __GNUG__
+    #pragma implementation "splittree.h"
+#endif
+
+// For compilers that support precompilation, includes "wx/wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+// for all others, include the necessary headers (this file is usually all you
+// need because it includes almost all "standard" wxWindows headers)
+#ifndef WX_PRECOMP
+    #include "wx/wx.h"
+#endif
+
 #include "wx/gizmos/dynamicsash.h"
 
 /*