(WM_MOUSEHWHEEL): Define if system headers don't.

diff --git a/src/w32term.h b/src/w32term.h
index 3e7f3a3a6a939acfc32788cf7226683a1844f0b0..1af1d89846ff479c8ef29202781da7a603f08292 100644 (file)
--- a/src/w32term.h
+++ b/src/w32term.h
@@ -612,6 +612,9 @@ extern void w32_unload_font ();
 #define WM_XBUTTONDOWN                 (WM_MOUSEWHEEL + 1)
 #define WM_XBUTTONUP                   (WM_MOUSEWHEEL + 2)
 #endif /* WM_XBUTTONDOWN */
+#ifndef WM_MOUSEHWHEEL
+#define WM_MOUSEHWHEEL                 (WM_MOUSEWHEEL + 4)
+#endif /* WM_MOUSEHWHEEL  */
 
 #define WM_EMACS_START                 (WM_USER + 1)
 #define WM_EMACS_KILL                  (WM_EMACS_START + 0)