diff --git a/Mac/mwerks/mwfopenrf.c b/Mac/mwerks/mwfopenrf.c
index e07cf50..60ca3f8 100644
--- a/Mac/mwerks/mwfopenrf.c
+++ b/Mac/mwerks/mwfopenrf.c
@@ -4,7 +4,7 @@
 ** Jack Jansen, CWI, August 1995.
 */
 
-#ifdef __MWERKS__
+#if defined(__MWERKS__) && !defined(USE_GUSI)
 #include <stdio.h>
 #include <unix.h>
 #include <errno.h>
diff --git a/Mac/mwerks/old/mwerks_nsgusi_config.h b/Mac/mwerks/old/mwerks_nsgusi_config.h
new file mode 100644
index 0000000..3d2a824
--- /dev/null
+++ b/Mac/mwerks/old/mwerks_nsgusi_config.h
@@ -0,0 +1,11 @@
+#define HAVE_CONFIG_H
+// #define USE_STDWIN
+// #define USE_MACTCP
+#define USE_BGEN
+#define USE_MACSPEECH
+// #define USE_IMG
+#define USE_MACCTB
+#ifdef __powerc
+#define USE_MAC_DYNAMIC_LOADING
+#endif
+#define USE_GUSI