diff -u iup.orig/src/win/iupwin_dialog.c iup.new/src/win/iupwin_dialog.c
--- iup.orig/src/win/iupwin_dialog.c	2016-03-18 19:39:13.000000000 +0100
+++ iup.new/src/win/iupwin_dialog.c	2016-07-09 16:35:20.799022400 +0200
@@ -58,7 +58,9 @@
                      ITaskbarList3 resources
 ****************************************************************/
 #ifndef __MINGW32__
+#if !defined(__GNUC__) || __GNUC__ > 3
 #include "Shobjidl.h"
+#endif
 
 #ifdef __ITaskbarList3_FWD_DEFINED__  /* Only available since VC10 */