#define XEMACS_MOD_HYPER (1<<3)
#define XEMACS_MOD_ALT (1<<4)
#define XEMACS_MOD_SHIFT (1<<5) /* not used for dual-case characters */
+#define XEMACS_MOD_BUTTON1 (1<<6)
+#define XEMACS_MOD_BUTTON2 (1<<7)
+#define XEMACS_MOD_BUTTON3 (1<<8)
+#define XEMACS_MOD_BUTTON4 (1<<9)
+#define XEMACS_MOD_BUTTON5 (1<<10)