USE_PRECOMPILED_HEADERS renamed to MSL_USE_PRECOMPILED_HEADERS
diff --git a/Mac/mwerks/mwerks_plugin_config.h b/Mac/mwerks/mwerks_plugin_config.h
index c087b82..0052df8 100644
--- a/Mac/mwerks/mwerks_plugin_config.h
+++ b/Mac/mwerks/mwerks_plugin_config.h
@@ -5,6 +5,6 @@
#define USE_GUSI /* Stdio implemented with GUSI */
#define USE_MSL /* Use MSL libraries */
#ifdef USE_MSL
-#define USE_PRECOMPILED_HEADERS 0 /* Don't use precomp headers: we include our own */
+#define MSL_USE_PRECOMPILED_HEADERS 0 /* Don't use precomp headers: we include our own */
#include <ansi_prefix.mac.h>
#endif