Modified for GUSI
diff --git a/Mac/Include/config.h b/Mac/Include/config.h
index c00e4e6..4fd79ec 100644
--- a/Mac/Include/config.h
+++ b/Mac/Include/config.h
@@ -13,8 +13,21 @@
 #define HAVE_FOPENRF
 #endif
 #ifdef __MWERKS__
+#ifndef USE_GUSI
 #define HAVE_FOPENRF
 #endif
+#endif
+
+#ifdef USE_GUSI
+/* GUSI provides a lot of unixisms */
+#define HAVE_SELECT
+#define DIRENT
+#define HAVE_GETPEERNAME
+#define HAVE_SELECT
+#define HAVE_FCNTL_H
+#define HAVE_SYS_TIME_H
+#define HAVE_UNISTD_H
+#endif
 
 #ifdef SYMANTEC__CFM68K__
 #define atof Py_AtoF