We should define both USE_GUSI and USE_GUSI2.
diff --git a/Mac/Build/_tkinter.prj b/Mac/Build/_tkinter.prj
index d366cfe..d3eb78d 100644
--- a/Mac/Build/_tkinter.prj
+++ b/Mac/Build/_tkinter.prj
Binary files differ
diff --git a/Mac/mwerks/mwerks_tkplugin_config.h b/Mac/mwerks/mwerks_tkplugin_config.h
index bd3b474..f13d9ab 100644
--- a/Mac/mwerks/mwerks_tkplugin_config.h
+++ b/Mac/mwerks/mwerks_tkplugin_config.h
@@ -2,8 +2,11 @@
** Special config-file for _tkinter plugin.
*/
-#define USE_GUSI1 /* Stdio implemented with GUSI */
-/* #define USE_GUSI2 /* Stdio implemented with GUSI */
+#define USE_GUSI2 /* Stdio implemented with GUSI 2 */
+/* #define USE_GUSI1 /* Stdio implemented with GUSI 1.X */
+#if defined(USE_GUSI1) || defined(USE_GUSI2)
+#define USE_GUSI
+#endif
#define WITH_THREAD /* Use thread support (needs GUSI 2, not GUSI 1) */
#define USE_TK /* Include _tkinter module in core Python */
#define MAC_TCL /* This *must* be on if USE_TK is on */