Added guesstabsize() for the mac
diff --git a/Parser/pgenmain.c b/Parser/pgenmain.c
index da6aa2e..6737326 100644
--- a/Parser/pgenmain.c
+++ b/Parser/pgenmain.c
@@ -143,6 +143,16 @@
 	exit(1);
 }
 
+#ifdef macintosh
+/* ARGSUSED */
+int
+guesstabsize(path)
+	char *path;
+{
+	return 4;
+}
+#endif
+
 /* XXX TO DO:
    - check for duplicate definitions of names (instead of fatal err)
 */